diff --git a/nasal_builtin.h b/nasal_builtin.h
index 642c67d..12b455a 100644
--- a/nasal_builtin.h
+++ b/nasal_builtin.h
@@ -208,12 +208,13 @@ int nasal_runtime::builtin_finput(int local_scope_addr)
     if(!fin.fail())
         while(!fin.eof())
         {
-            file_content.push_back(fin.get());
+            char c=fin.get();
             if(fin.eof())
                 break;
+            file_content.push_back(c);
         }
     else
-        file_content="cannot open file named \'"+filename+"\'.";
+        file_content="";
     fin.close();
     int ret_addr=nasal_vm.gc_alloc();
     nasal_vm.gc_get(ret_addr).set_type(vm_string);
@@ -347,10 +348,10 @@ int nasal_runtime::builtin_rand(int local_scope_addr)
 }
 int nasal_runtime::builtin_id(int local_scope_addr)
 {
-    int value_addr=in_builtin_find("id");
+    int value_addr=in_builtin_find("thing");
     if(value_addr<0)
     {
-        std::cout<<">> [runtime] builtin_id: cannot find \"id\".\n";
+        std::cout<<">> [runtime] builtin_id: cannot find \"thing\".\n";
         ++error;
         return -1;
     }
diff --git a/nasal_gc.h b/nasal_gc.h
index bdfc36c..36ba61e 100644
--- a/nasal_gc.h
+++ b/nasal_gc.h
@@ -286,6 +286,8 @@ int nasal_hash::get_value_address(std::string key)
             }
         }
     }
+    else
+        std::cout<<">> [runtime] cannot find hash member \""<<key<<"\".\n";
     return ret_value_addr;
 }
 int nasal_hash::get_mem_address(std::string key)
@@ -311,6 +313,15 @@ int nasal_hash::get_mem_address(std::string key)
             }
         }
     }
+    else
+    {
+        int mem_addr=nasal_vm.mem_alloc();
+        int val_addr=nasal_vm.gc_alloc();
+        nasal_vm.gc_get(val_addr).set_type(vm_nil);
+        nasal_vm.mem_init(mem_addr,val_addr);
+        elems[key]=mem_addr;
+        ret_mem_addr=mem_addr;
+    }
     return ret_mem_addr;
 }
 bool nasal_hash::check_contain(std::string key)
diff --git a/nasal_runtime.h b/nasal_runtime.h
index 1e3c392..396e227 100644
--- a/nasal_runtime.h
+++ b/nasal_runtime.h
@@ -940,18 +940,18 @@ int nasal_runtime::call_function(nasal_ast& node,std::string func_name,int base_
     int run_closure_addr=reference_of_func.get_closure_addr();
     nasal_closure& run_closure=nasal_vm.gc_get(run_closure_addr).get_closure();
     run_closure.add_scope();
-    // set self
-    if(func_name.length())
-    {
-        nasal_vm.add_reference(base_value_addr);
-        run_closure.add_new_value(func_name,base_value_addr);
-    }
     // set hash.me
     if(last_call_hash_addr>=0)
     {
         nasal_vm.add_reference(last_call_hash_addr);
         run_closure.add_new_value("me",last_call_hash_addr);
     }
+    else if(func_name.length())
+    {
+        // when hash.me does not exist,set self
+        nasal_vm.add_reference(base_value_addr);
+        run_closure.add_new_value(func_name,base_value_addr);
+    }
     nasal_ast& argument_format=reference_of_func.get_arguments();
     if(!node.get_children().size())
     {
diff --git a/test/NasNeuron.nas b/test/NasNeuron.nas
new file mode 100644
index 0000000..ae2a951
--- /dev/null
+++ b/test/NasNeuron.nas
@@ -0,0 +1,96 @@
+# NasNeuron lib written by ValKmjolnir
+
+# Basic Class NasMatrix
+# NasMatGen  : generate a new matrix
+# NasMatAdd  : add two matrixes
+# NasMatSub  : sub two matrixes
+# NasMatMul  : multiply two matrix
+# NasMatTrans: transpose a matrix
+# NasMatPrt  : print a matrix
+var NasMatrix=
+{
+    NasMatGen:func(row,col)
+    {
+        var GenMat={Row:row,Col:col,Elem:[]};
+        for(var i=0;i<row;i+=1)
+        {
+            var TmpVec=[];
+            for(var j=0;j<col;j+=1)
+                append(TmpVec,0);
+            append(GenMat.Elem,TmpVec);
+        }
+        return GenMat;
+    },
+    NasMatAdd:func(mat1,mat2)
+    {
+        var ResultMat=nil;
+        if(mat1.Row==mat2.Row and mat1.Col==mat2.Col)
+        {
+            ResultMat=me.NasMatGen(mat1.Row,mat1.Col);
+            for(var i=0;i<ResultMat.Row;i+=1)
+                for(var j=0;j<ResultMat.Col;j+=1)
+                    ResultMat.Elem[i][j]=mat1.Elem[i][j]+mat2.Elem[i][j];
+        }
+        else
+            print("NasNeuron: Mat1 and Mat2 have different rows and cols.");
+        return ResultMat;
+    },
+    NasMatSub:func(mat1,mat2)
+    {
+        var ResultMat=nil;
+        if(mat1.Row==mat2.Row and mat1.Col==mat2.Col)
+        {
+            ResultMat=me.NasMatGen(mat1.Row,mat1.Col);
+            for(var i=0;i<ResultMat.Row;i+=1)
+                for(var j=0;j<ResultMat.Col;j+=1)
+                    ResultMat.Elem[i][j]=mat1.Elem[i][j]-mat2.Elem[i][j];
+        }
+        else
+            print("NasNeuron: Mat1 and Mat2 have different rows and cols.");
+        return ResultMat;
+    },
+    NasMatMul:func(mat1,mat2)
+    {
+        var ResultMat=nil;
+        if(mat1.Col==mat2.Row)
+        {
+            ResultMat=me.NasMatGen(mat1.Row,mat2.Col);
+            for(var i=0;i<ResultMat.Row;i+=1)
+                for(var j=0;j<ResultMat.Col;j+=1)
+                {
+                    var sum=0;
+                    for(var k=0;k<mat1.Col;k+=1)
+                        sum+=mat1.Elem[i][k]*mat2.Elem[k][j];
+                    ResultMat.Elem[i][j]=sum;
+                }  
+        }
+        else
+            print("NasNeuron: Mat1's Col is different from Mat2's Row.");
+        return ResultMat;
+    },
+    NasMatTrans:func(mat)
+    {
+        var ResultMat=nil;
+        ResultMat=me.NasMatGen(mat.Col,mat.Row);
+        for(var i=0;i<ResultMat.Row;i+=1)
+            for(var j=0;j<ResultMat.Col;j+=1)
+                ResultMat.Elem[i][j]=mat.Elem[j][i];
+        return ResultMat;
+    },
+    NasMatPrt:func(mat)
+    {
+        for(var i=0;i<mat.Row;i+=1)
+        {
+            for(var j=0;j<mat.Col;j+=1)
+                print(mat.Elem[i][j],' ');
+            print('\n');
+        }
+        return nil;
+    }
+};
+
+NasMatrix.NasMatPrt(
+    NasMatrix.NasMatGen(
+        10,100
+        )
+    );
\ No newline at end of file
diff --git a/test/bfs.nas b/test/bfs.nas
new file mode 100644
index 0000000..f79ed57
--- /dev/null
+++ b/test/bfs.nas
@@ -0,0 +1,65 @@
+import("lib.nas");
+import("queue.nas");
+
+rand(time(0));
+
+var map=[];
+for(var i=0;i<10;i+=1)
+{
+    append(map,[]);
+    for(var j=0;j<10;j+=1)
+        append(map[i],(rand()>0.7));
+}
+
+var prt=func()
+{
+    var s="";
+    for(var i=0;i<10;i+=1)
+    {
+        for(var j=0;j<10;j+=1)
+            s~=map[i][j];
+        s~='\n';
+    }
+    print(s);
+}
+
+var bfs=func(begin,end)
+{
+    var move=[[1,0],[0,1],[-1,0],[0,-1]];
+    var queue=new_queue();
+    queue_push(queue,begin);
+    map[begin[0]][begin[1]]=3;
+    while(!queue_empty(queue))
+    {
+        var vertex=queue_front(queue);
+        queue_pop(queue);
+        foreach(var i;move)
+        {
+            var x=vertex[0]+i[0];
+            var y=vertex[1]+i[1];
+            if(x==end[0] and y==end[1])
+            {
+                map[x][y]='*';
+                return;
+            }
+            if(0<=x and x<10 and 0<=y and y<10 and map[x][y]==0)
+            {
+                queue_push(queue,[x,y]);
+                map[x][y]=3;
+            }
+        }
+        prt();
+    }
+    print("cannot reach.");
+    return;
+}
+
+prt();
+var x=num(input());
+var y=num(input());
+var begin=[x,y];
+x=num(input());
+y=num(input());
+var end=[x,y];
+bfs(begin,end);
+prt();
\ No newline at end of file
diff --git a/test/choice.nas b/test/choice.nas
new file mode 100644
index 0000000..2f9dcec
--- /dev/null
+++ b/test/choice.nas
@@ -0,0 +1,29 @@
+
+var condition_true=1;
+var condition_false=0;
+if(condition_true)
+{
+    var a=1;
+}
+else if(!condition_false)
+{
+    var b=1;
+}
+elsif(!condition_true and condition_false)
+{
+    print("impossible");
+}
+else
+{
+    var c=1;
+    var d=1;
+}
+
+if(condition_true)
+    var a=1;
+else if(!condition_false)
+    var b=1;
+elsif(!condition_true and condition_false)
+    print("impossible");
+else
+    var c=1;
\ No newline at end of file
diff --git a/test/efb.nas b/test/efb.nas
new file mode 100644
index 0000000..01c964d
--- /dev/null
+++ b/test/efb.nas
@@ -0,0 +1,2044 @@
+#// Wrappers for property I/O, for conveniently switching between two methods
+var setProp = func(prop, value){
+    #// setprop(prop, value);
+    props.getNode("/").setValue(prop, value);
+}
+var getProp = func(prop){
+    #// getprop(prop);
+    props.getNode("/").getValue(prop);
+}
+
+var ChartsList =
+{
+    'KATL':
+    {
+        STAR: ["STAR_CANUK1_RNAV", "STAR_ERLIN9_RNAV", "STAR_FLCON7_RNAV", "STAR_HERKO6_RNAV", "STAR_HONIE8_RNAV", "STAR_LA_GRANGE2", "STAR_PECHY7_RNAV", "STAR_ROME4", "STAR_RPTOR1_RNAV", "STAR_SINCA5", "STAR_VIKNN_3RNAV", "STAR_WHINZ1"],
+        STARs: 12,
+        IAP: ["ILS_8L_Cat II - III", "ILS_PRM_8L", "ILS_PRM_8L_CAT II - III", "ILS_PRM_8R", "ILS_PRM_9L", "ILS-LOC_8L", "ILS-LOC_8R", "ILS-LOC_9L"],
+        IAPs: 8,
+        SID: ["SID_ATL5", "SID_BRAV6_RNAV", "SID_CADIT6_RNAV", "SID_COKEM5_RNAV", "SID_DAWGS5_RNAV", "SID_DOOLY5_RNAV", "SID_GEETK6_RNAV", "SID_JCKTS6_RNAV", "SID_JOGOR4_RNAV", "SID_MUNSN5_RNAV", "SID_NOVSS4_RNAV", "SID_NUGGT5_RNAV"],
+        SIDs: 12,
+        APT: "APT_0",
+        APTs: 1,
+        LOCATION: "ATLANTA USA",
+        NAME: "Hartsfield-Jackson"
+    },
+    'KLAX':
+    {
+        STAR: "REDEYE2",
+        STARs: 1,
+        IAP: ["06L-ILS", "06R-ILS", "07L-ILS", "07R-ILS"],
+        IAPs: 4,
+        SID: "SNGO6",
+        SIDs: 1,
+        APT: "APT_0",
+        APTs: 1,
+        LOCATION: "LOS ANGELES USA",
+        NAME: "Intntl"
+    },
+    'KIAH':
+    {
+        STAR: ["RIICE3_1", "RIICE_2"],
+        STARs: 2,
+        IAP: ["09-ILS", "15R-ILS"],
+        IAPs: 2,
+        SID: "",
+        SIDs: 0,
+        APT: "APT_0",
+        APTs: 1,
+        LOCATION: "HOUSTON USA",
+        NAME: "G. Bush Intctl"
+    },
+    'VABB':
+    {
+        STAR: "",
+        STARs: 0,
+        IAP: ["09-ILS-DME", "14-ILS-DME"],
+        IAPs: 2,
+        SID: "EKPOSxA",
+        SIDs: 1,
+        APT: "APT_0",
+        APTs: 1,
+        LOCATION: "MUMBAI IN",
+        NAME: "Chhatrapati Shivaji"
+    },
+    'KMEM':
+    {
+        STAR: "BEERT4",
+        STARs: 1,
+        IAP: "09-ILS_LOC",
+        IAPs: 1,
+        SID: "",
+        SIDs: 0,
+        APT: "APT_0",
+        APTs: 1,
+        LOCATION: "MEMPHIS USA",
+        NAME: "International"
+    },
+    'LFRB':
+    {
+        STAR: "STAR",
+        STARs: 1,
+        IAP: ["IAP_25L", "IAP_25L_RNAV", "ILS_Y_25L", "ILS_YZ_07R", "ILS_Z_25L", "NDB_25L", "RADAR", "RNAV_07R", "VFR_APP01", "VFR_LNDG_01"],
+        IAPs: 11,
+        SID: ["SID_07R", "SID_25L"],
+        SIDs: 2,
+        APT: ["APT_0", "APT_1"],
+        APTs: 2,
+        LOCATION: "BREST FR",
+        NAME: "Guipavas"
+    },
+    'LFRM':
+    {
+        STAR: ["VFR_APP01", "VFR_LND01"],
+        STARs: 2,
+        IAP: "",
+        IAPs: 0,
+        SID: "",
+        SIDs: 0,
+        APT: "APT_0",
+        APTs: 1,
+        LOCATION: "LE MANS FR",
+        NAME: "Arnage"
+    },
+    'LIME':
+    {
+        STAR: ["STAR_ASTIG_ODINA_1S", "STAR_ASTIG_ODINA_1T", "STAR_DIXER_GEN_IDONA_1S", "STAR_DIXER_GEN_IDONA_1T", "STAR_DORIN_LUSIL_OSKOR_1S", "STAR_DORIN_LUSIL_OSKOR_1T", "STAR_East", "STAR_West", "STAR_VOR_DME", "VOR_Y28", "VOR_Y28_2", "VOR_Z28"],
+        STARs: 12,
+        IAP: ["ILS-PAPA-28", "ILS-PAPA-28-CAT II", "ILS-SIERRA-28", "ILS-SIERRA-28-CAT II", "ILS-TANGO-28", "ILS-TANGO-28-CAT II", "ILS-X28", "ILS-Y28", "ILS-Z28"],
+        IAPs: 9,
+        SID: ["SID_10_BEKAN_DORIN_5S", "SID_10-28_BEKAN5T_DORIN5T_ORI5QT", "SID_10-28_Alternate", "SID_28_SRN5R_TZO5R_TZO5S", "SID_InitialClimb", "SID10_InitialClimb", "SID28_InitialClimb", "SID28_InitialClimb2", "DEP_North_East", "DEP_South", "DEP_West"],
+        SIDs: 12,
+        APT: ["APT_0", "APT_0_Small", "GROUND_East_Apron", "GROUND_North_Apron", "GROUND_West_Apron"],
+        APTs: 6,
+        LOCATION: "BERGAMO IT",
+        NAME: "Orio al Serio"
+    },
+    'LOWI':
+    {
+        STAR: ["26-RTT", "STAR", "VFR_East", "VFR_West_KTI", "West-NDB_KYI"],
+        STARs: 5,
+        IAP: ["LOC_26_RNAV", "LOC_DME_East", "LOC_DME_West", "NDB_East", "RNAV_08", "RNAV_26", "SPEC_LOC_DME_East"],
+        IAPs: 8,
+        SID: ["08-RTT", "General Departure", "SID_08", "SID0_RTT1W", "SID_08_SPECPERF_KPT1Z", "SID_08_SPECPERF_RTT2Z", "SID-26", "SID_26_MOGTI1H_RTT1Y", "SID_26_RNAV"],
+        SIDs: 9,
+        APT: ["APT_0", "APT_1"],
+        APTs: 2,
+        LOCATION: "INNSBRUCK AT",
+        NAME: "Kranebitten"
+    },
+    'WSSS':
+    {
+        STAR: ["BOBAG1A", "BOBAG1B", "LAVAX1A", "LAVAX1B"],
+        STARs: 4,
+        IAP: ["02C-VOR-DME", "02L-ILS", "02L-ILS-CATII", "20C-VOR-DME", "20R-ILS"],
+        IAPs: 5,
+        SID: "BOG1",
+        SIDs: 1,
+        APT: ["APT_0", "APT_1"],
+        APTs: 2,
+        LOCATION: "SINGAPORE SG",
+        NAME: "Changi"
+    },
+};
+
+# used in page
+var l=[];
+var r=[];
+for(var i=0;i<21;i+=1)
+{
+    append(l,"");
+    append(r,"");
+}
+var KCl0_0 = "";
+var KCl0_1 = "";
+var KCl0   = "";
+var KCl1   = "";
+var KCl2   = "";
+var KCl3   = "";
+var KCl4   = "";
+var KCr1   = "";
+var KCr2   = "";
+var KCr3   = "";
+var KCr4   = "";
+var KCr5   = "";
+var KCr6   = "";
+var ChartName = ["NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL"];
+var ChartDisp = ["NULL", "NULL", "NULL"];
+var Keyboard_Helper = "";
+var Keyboard_Message = "";
+var Index_Max = 0;
+var Index_Offset = 0;
+var PageList = 0;
+
+# used in efb
+var ZoomFact = 0;
+var PanHFact = 0;
+var PanVFact = 0;
+var OriginApt      = "NOT Set";
+var DestinationApt = "NOT Set";
+var ClosingFlightFlag = 0;
+var lenght = 0;
+var Temp_String = "";
+var Cnv_Fact = 0;
+var VK_Key = "";
+var VK_Input_Mem  = 0;
+var VK_Output_Mem = 0;
+var TMZ_Input_Lenght     = 0;
+var TMZ_Converted_ID     = "";
+var TMZ_Converted_Name   = "";
+var TMZ_Converted_OffSet = "";
+var TMZ_zulu_HH = "";
+var TMZ_Index = 0;
+var TMZ_DB_Size = 0;
+var Output_TMZ_Line = "";
+var TMZ_DATE = "";
+var TMZ_TIME = "";
+var Output_HH = 0;
+var Output_MM = 0;
+var CUT = ["NULL", "NULL", "NULL"];
+var Initial_FL = 0;
+var Target_FL  = 0;
+var Initial_GS = 0;
+var Target_GS  = 0;
+var DRC_String = "";
+var DRC_Input_Lenght = 0;
+
+# public vars
+var helper = "";
+var keypress = "";
+var nochart = "";
+var AptName = "Unknown";
+var Chart_Pages = 1;
+var DRC_Distance = 0;
+var DRC_l3 = "";
+var DRC_r3 = "";
+var DRC_l5 = "";
+var DRC_r5 = "";
+var DRC_l7 = "";
+var DRC_r8 = "";
+var DRC_r9 = "";
+var DRC_r10 ="";
+
+#  Chart Properties 
+ident = getProp("/sim/airport/closest-airport-id");
+#AptName = getProp("/instrumentation/efb/chart/icao");
+
+if (ident != nil)
+{
+    setProp("instrumentation/efb/chart/icao", ident);
+    setProp("instrumentation/efb/chart/DEP_icao", getProp("/instrumentation/efb/chart/icao"));
+} else setProp("/instrumentation/efb/chart/icao", "");
+setProp("/instrumentation/efb/chart/type", "APT");
+setProp("/instrumentation/efb/chart/newairport", 0);
+setProp("/instrumentation/efb/FlightStatus", 0);        # INACTIVE
+nochart = 0;
+
+var page = {
+    update : func {
+        for(var i=0; i<21; i+=1)
+            setProp("/instrumentation/efb/display/line"~i~"-l", l[i]);
+        # r[0] haven't been used
+        for(var i=1; i<21; i+=1)
+            setProp("/instrumentation/efb/display/line"~i~"-r", r[i]);
+        setProp("/instrumentation/efb/display/input-helper", helper);
+        setProp("/instrumentation/efb/keypress", keypress);
+        return;
+    },
+    clearpage : func {
+        for(var i=0; i<21; i+=1){
+            l[i] = "";
+            r[i] = "";
+        }
+        helper = "";
+        return;
+    },
+    index : func {
+        for(var i=0; i<21; i+=1){
+            l[i] = "";
+            r[i] = "";
+        }
+        return;
+    },
+    index_TEST : func {
+        for(var i=0; i<21; i+=1)
+            l[i] = "< TEST_L"~i;
+        # r[0] haven't been used
+        for(var i=1; i<15; i+=1)
+            r[i] = "TEST >";
+        for(var i=15; i<21; i+=1)
+            r[i] = "TEST_R"~i~" >";
+        return;
+    },
+    KCupdate : func {
+        setProp("/instrumentation/efb/display/lineAPT_NAME", KCl0);
+        setProp("/instrumentation/efb/display/lineAPT_LOCATION", KCl0_0);
+        setProp("/instrumentation/efb/display/lineAPT_PAGESHOW", KCl0_1);
+        setProp("/instrumentation/efb/display/lineSTAR", KCl1);
+        setProp("/instrumentation/efb/display/lineIAP", KCl2);
+        setProp("/instrumentation/efb/display/lineSID", KCl3);
+        setProp("/instrumentation/efb/display/lineAPT", KCl4);
+
+        setProp("/instrumentation/efb/display/lineCHART1-r", KCr1);
+        setProp("/instrumentation/efb/display/lineCHART2-r", KCr2);
+        setProp("/instrumentation/efb/display/lineCHART3-r", KCr3);
+
+        setProp("/instrumentation/efb/Keyboard/CHART_Input_Line", Keyboard_Helper);
+        setProp("/instrumentation/efb/Keyboard/CHART_Output_Line", Keyboard_Message);
+    },
+    KCclearpage : func {
+        KCl0 = "";
+        KCl0_0 = "";
+        KCl0_1 = "";
+        KCl1 = "";
+        KCl2 = "";
+        KCl3 = "";
+        KCl4 = "";
+
+        KCr1 = "";
+        KCr2 = "";
+        KCr3 = "";
+
+        Keyboard_Helper = "";
+        Keyboard_Message = "";
+        helper = "";
+    },
+    DRCupdate : func {
+        setProp("/instrumentation/efb/display/DRC_l3", DRC_l3);
+        setProp("/instrumentation/efb/display/DRC_l5", DRC_l5);
+        setProp("/instrumentation/efb/display/DRC_r3", DRC_r3);
+        setProp("/instrumentation/efb/display/DRC_r5", DRC_r5);
+        setProp("/instrumentation/efb/display/DRC_l7", DRC_l7);
+        setProp("/instrumentation/efb/display/DRC_r8", DRC_r8);
+        setProp("/instrumentation/efb/display/DRC_r9", DRC_r9);
+        setProp("/instrumentation/efb/display/DRC_r10", DRC_r10);
+    },
+    DRCclearpage : func {
+        DRC_l3 = "";
+        DRC_l5 = "";
+        DRC_r3 = "";
+        DRC_r5 = "";
+        DRC_l7 = "";
+        DRC_r8 = "";
+        DRC_r9 = "";
+        DRC_r10 = "";
+    },
+    airportinfo : func {
+        var ClosestName = "";
+        if (getProp("/instrumentation/gps/scratch/name") == nil)
+            ClosestName = "";
+        else
+            ClosestName = getProp("/instrumentation/gps/scratch/name");
+        l[2] = "Airport   : " ~ getProp("/instrumentation/gps/scratch/ident") ~ " (" ~ ClosestName ~ ")";
+        l[3] = "Latitude  : " ~ sprintf("%3.4f", getProp("/instrumentation/gps/scratch/latitude-deg"));
+        l[4] = "Longitude : " ~ sprintf("%3.4f", getProp("/instrumentation/gps/scratch/longitude-deg"));
+        l[5] = "Elevation : " ~ sprintf("%3.4f", getProp("/instrumentation/gps/scratch/altitude-ft")) ~ " ft";
+        setProp("/environment/metar[6]/station-id", getProp("/instrumentation/gps/scratch/ident"));
+        l[7] = "Runways : ";
+        l[8] = "         ";
+        for (var n=0; n<12; n+=1) {
+            if (getProp("/instrumentation/gps/scratch/runways[" ~ n ~ "]/id") != nil) {
+                if (n <= 7) l[7] = l[7] ~ getProp("/instrumentation/gps/scratch/runways[" ~ n ~ "]/id") ~ " ";
+                else l[8] = l[8] ~ getProp("/instrumentation/gps/scratch/runways[" ~ n ~ "]/id") ~ " ";
+            }
+            l[10] = "Weather Source: NOAA/METAR";
+            r[10] = substr(getProp("/environment/metar[6]/data"),0,16) ~ "z";
+            l[11] = substr(getProp("/environment/metar[6]/data"),17,41);
+            if (size(getProp("/environment/metar[6]/data")) > 41)
+                l[12] = substr(getProp("/environment/metar[6]/data"), 58, 41);
+            l[13] = "           Current Weather Situation";
+            l[14] = "Temperature : " ~ sprintf("%3.2f", getProp("/environment/metar[6]/temperature-degc")) ~ " �C";
+            r[14] = "Dewpoint : " ~ sprintf("%3.2f", getProp("/environment/metar[6]/dewpoint-degc")) ~ " �C";
+            l[15] = "Wind Direction : " ~ sprintf("%3.0f", getProp("/environment/metar[6]/base-wind-dir-deg")) ~ " degs";
+            r[15] = "Wind Speed : " ~ sprintf("%3.0f", getProp("/environment/metar[6]/base-wind-speed-kt")) ~ " Kt";
+            l[16] = "Max Visibility : " ~ sprintf("%3.0f", getProp("/environment/metar[6]/max-visibility-m")) ~ " ft";
+            r[16] = "Min Visibility : " ~ sprintf("%3.0f", getProp("/environment/metar[6]/min-visibility-m")) ~ " ft";
+            l[17] = "Relative Humidity : " ~ sprintf("%3.2f", getProp("/environment/metar[6]/rel-humidity-norm")) ~ " %";
+            l[18] = "Pressure : " ~ sprintf("%3.2f", getProp("/environment/metar[6]/pressure-inhg")) ~ " inHg";
+            l[20] = "Weather Report subject to Station availability";
+        }
+    },
+    FlightMonitor : func {
+        if (getProp("/instrumentation/efb/FlightStatus") == 1) {
+            var FStatus = "ACTIVE";
+        } else FStatus = "INACTIVE";
+        if (getProp("/autopilot/route-manager/active") == 1) {
+            if (getProp("/autopilot/route-manager/departure/takeoff-time") != nil) { 
+                var TOT = getProp("/autopilot/route-manager/departure/takeoff-time") ~ "z";
+            } else TOT = "Unknown";
+            if (getProp("/autopilot/route-manager/destination/touchdown-time") != nil) { 
+                var TDT = getProp("/autopilot/route-manager/destination/touchdown-time") ~ "z";
+            } else TDT = "Unknown";
+            var OAPT = getProp("/autopilot/route-manager/departure/airport") ~ " " ~ getProp("/autopilot/route-manager/departure/runway");
+            var DAPT = getProp("/autopilot/route-manager/destination/airport") ~ " " ~ getProp("/autopilot/route-manager/destination/runway");
+        } else { 
+            OAPT = "NOT Set";
+            DAPT = "NOT Set";
+            TOT = "Unknown";
+            TDT = "Unknown";
+        }
+        l[2]  = "Aircraft: " ~ getProp("/sim/description") ~ " Seattle";
+        l[3]  = "Operator: " ~ substr(getProp("/sim/aircraft-operator"),0,3);
+        r[3]  = "CallSign: " ~ substr(getProp("/sim/multiplay/callsign"), 0,6);
+        l[4]  = "Flight No: " ~ "NOT Set"; # This will be set through CDU (To be done)
+        r[4]  = "Flight Status: " ~ FStatus;
+        l[5]  = "Origin APT: " ~ OAPT;
+        r[5]  = "TO Time: " ~ TOT;
+        l[6]  = "Destination APT: " ~ DAPT;
+        r[6]  = "TD Time: " ~ TDT;
+        l[7]  = "Date: " ~ substr(getProp("environment/metar/data"),0,10);
+        r[7]  = "Time: " ~ getProp("/instrumentation/clock/indicated-short-string") ~ "z";
+        l[9]  = "Ind. ALT: " ~ sprintf("%3.2f", getProp("/Instrumentation/altimeter/indicated-altitude-ft")) ~ " ft";
+        r[9]  = "Press. ALT: " ~ sprintf("%3.2f", getProp("/Instrumentation/altimeter/pressure-alt-ft")) ~ " ft";
+        l[10] = "Press. hPa: " ~ sprintf("%3.2f", getProp("/Instrumentation/altimeter/setting-hpa"));
+        r[10] = "Press. inHg: " ~ sprintf("%3.2f", getProp("/Instrumentation/altimeter/setting-inhg"));
+        l[11] = "Speed Knots: " ~ sprintf("%3.0f", getProp("/Instrumentation/airspeed/indicated-speed-kt"));
+        r[11] = "Speed Mach: " ~ sprintf("%3.0f", getProp("/Instrumentation/airspeed/indicated-mach"));
+        l[12] = "Temperature �C: " ~ sprintf("%3.2f", getProp("/environment/temperature-degc"));
+        r[12] = "Temperature �F: " ~ sprintf("%3.2f", getProp("/environment/temperature-degf"));
+        l[13] = "Wind Dir.: " ~ sprintf("%3.0f", getProp("/environment/metar/base-wind-dir-deg")) ~ " degs";
+        r[13] = "Wind Speed: " ~ sprintf("%3.0f", getProp("/environment/base-wind-speed-kt")) ~ " kts";
+        l[14] = "Total Fuel: " ~ sprintf("%3.2f", getProp("/consumables/fuel/total-fuel-gals")) ~ " gals";
+        l[15] = "Gross Weight: " ~ sprintf("%3.2f", getProp("/yasim/gross-weight-lbs")) ~ " lbs";
+        # warning: this line l[14] has been changed to l[15],be careful of bugs.But it must be at the right side
+    },
+    gps : func {
+        l[1]  = "         GPS POSITION / SETTINGS";
+        l[2]  = "Latitude  : " ~ sprintf("%3.2f", getProp("/instrumentation/gps/indicated-latitude-deg")) ~ " degs";
+        r[2]  = "Longitude : " ~ sprintf("%3.2f", getProp("/instrumentation/gps/indicated-longitude-deg")) ~ " degs";
+        l[13] = "GPS Mode: " ~ getProp("/instrumentation/gps/mode");
+        r[13] = "WayPoint ID: " ~ getProp("/instrumentation/gps/wp/wp[1]/ID");
+        l[14] = "Leg Distance: " ~ sprintf("%3.2f", getProp("/instrumentation/gps/wp/leg-distance-nm")) ~ " Nm";
+        l[15] = "Leg Magnetic Course : " ~ sprintf("%3.2f", getProp("/instrumentation/gps/wp/leg-mag-course-deg")) ~ " degs";
+        l[16] = "Leg True Heading: " ~ sprintf("%3.2f", getProp("/instrumentation/gps/wp/leg-true-course-deg")) ~ " degs";
+    },
+    charts_keyboard : func {
+        setProp("/instrumentation/efb/chart/Status", "ON");
+        setProp("/instrumentation/efb/chart/type", "APT");
+        PageList = getProp("/instrumentation/efb/chart/PageList");
+
+        # Checks existence of Charts in the DB by chart's type ~ "-0"; example: "KSFO/type-0"
+        var Chart_Search = "";
+        Chart_Search = sprintf("%s", getProp("/instrumentation/efb/chart/icao"));
+
+        # HERE we need to launch the SEARCH into the ChartsList hash
+        #if (getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ getProp("/instrumentation/efb/chart/type") ~ "-0") == nil ) { 
+        #   setProp("/instrumentation/efb/chart_Found", "NOT_FOUND");
+        #   nochart = 1;
+        #} else { 
+        #    setProp("/instrumentation/efb/chart_Found", "FOUND");
+        #   nochart = 0;
+        #}
+        
+        setProp("/instrumentation/efb/Keyboard/CHART_Input_Line", "Charts for " ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ ": " ~ getProp("/instrumentation/efb/chart_Found"));
+        if (nochart == 0) {
+            # gets the APT's Name & Location
+            setProp("/instrumentation/efb/chart/type", "NAME");
+            KCl0 = getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ getProp("/instrumentation/efb/chart/type"));
+            setProp("/instrumentation/efb/chart/type", "LOCATION");
+            KCl0_0 = getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ getProp("/instrumentation/efb/chart/type"));
+
+            setProp("/instrumentation/efb/chart/type", "APT");
+            # Gets the number of charts (by Type) in the Charts DB
+            STAR_Status = setProp("/instrumentation/efb/chart/NumSTARs", (getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ "STARs")));
+            IAP_Status = setProp("/instrumentation/efb/chart/NumIAPs", (getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ "IAPs")));
+            SID_Status = setProp("/instrumentation/efb/chart/NumSIDs", (getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ "SIDs")));
+            APT_Status = setProp("/instrumentation/efb/chart/NumAPTs", (getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ "APTs")));
+    
+            # Gets the Type of chart from Pilot's Selection
+
+            if (getProp("/instrumentation/efb/VK_Chart_Type") != "") {
+                if (getProp("/instrumentation/efb/VK_Chart_Type") == "STAR") {
+                    setProp("/instrumentation/efb/chart/type", "STAR");
+                    Keyboard_Message = getProp("/instrumentation/efb/chart/NumSTARs") ~ " " ~ getProp("/instrumentation/efb/chart/type") ~ " Charts for " ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ " Apt - Select a Chart";
+                    STAR_Status = 1;
+                } else STAR_STATUS = 0;
+                if (getProp("/instrumentation/efb/VK_Chart_Type") == "IAP") {
+                    setProp("/instrumentation/efb/chart/type", "IAP");
+                    Keyboard_Message = getProp("/instrumentation/efb/chart/NumIAPs") ~ " " ~ getProp("/instrumentation/efb/chart/type") ~ " Charts for " ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ " Apt - Select a Chart";
+                    IAP_Status = 1;
+                } else IAP_Status = 0;
+                if (getProp("/instrumentation/efb/VK_Chart_Type") == "SID") {
+                    setProp("/instrumentation/efb/chart/type", "SID");
+                    Keyboard_Message = getProp("/instrumentation/efb/chart/NumSIDs") ~ " " ~ getProp("/instrumentation/efb/chart/type") ~ " Charts for " ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ " Apt - Select a Chart";
+                    SID_Status = 1;
+                } else SID_Status = 0;
+                if (getProp("/instrumentation/efb/VK_Chart_Type") == "APT") {
+                    setProp("/instrumentation/efb/chart/type", "APT");
+                    Keyboard_Message = getProp("/instrumentation/efb/chart/NumAPTs") ~ " " ~ getProp("/instrumentation/efb/chart/type") ~ " Charts for " ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ " Apt - Select a Chart";
+                    APT_Status = 1;
+                } else APT_Status = 0;
+        
+                setProp("/instrumentation/efb/VK_Chart_Type", getProp("/instrumentation/efb/chart/type"));
+                setProp("/instrumentation/efb/chartsDB", "ChartsDB/");
+        
+                #setProp("/instrumentation/efb/chart/selected", getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ getProp("/instrumentation/efb/chart/type") ~ "-1"));
+
+                var lastn = getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ getProp("/instrumentation/efb/chart/type") ~ "s") - 1;
+                if (lastn <= 0) lastn = 0;
+        
+                if ((STAR_Status == 0) and (IAP_Status == 0) and (SID_Status == 0) and (APT_Status == 0)) { 
+                    setProp("/instrumentation/efb/chart/Status", 0);
+                    Keyboard_Message = "No Charts available for: " ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ " Apt";
+                    setProp("/instrumentation/efb/chart/Status", "OFF");
+                }
+
+                # Gets the available ICAO/Type charts in the Charts DB
+                for (var index = 0; index <= 29; index += 1)
+                    ChartName[index] = "";
+                
+                if (lastn > 0) {
+                    for (var index = 0; index <= lastn; index += 1) {
+                        setProp("/instrumentation/efb/chart/IDX", index);
+                        setProp("/instrumentation/efb/chart/selected", (getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ getProp("/instrumentation/efb/chart/type") ~ "-" ~ getProp("/instrumentation/efb/chart/IDX"))));
+                        ChartName[index] = getProp("/instrumentation/efb/chart/selected");
+                    }
+                } else { 
+                    setProp("/instrumentation/efb/chart/selected", (getProp("/instrumentation/efb/chartsDB/" ~ sprintf("%s", getProp("/instrumentation/efb/chart/icao")) ~ "/" ~ getProp("/instrumentation/efb/chart/type") ~ "-0")));
+                    ChartName[0] = getProp("/instrumentation/efb/chart/selected");
+                }
+                Keyboard_Helper = "Enter Airport ICAO";
+                setProp("/instrumentation/efb/Keyboard/CHART_Input_Line", Keyboard_Helper);
+                setProp("/instrumentation/efb/Keyboard/CHART_Output_Line", Keyboard_Message);
+
+                # Prints Charts values to Upper Input Display
+                if (getProp("/instrumentation/efb/chart/Status") == "ON") {
+                    KCl1 = sprintf(getProp("/instrumentation/efb/chart/NumSTARs"));
+                    KCl2 = sprintf(getProp ("/instrumentation/efb/chart/NumIAPs"));
+                    KCl3 = sprintf(getProp ("/instrumentation/efb/chart/NumSIDs"));
+                    KCl4 = sprintf(getProp ("/instrumentation/efb/chart/NumAPTs"));
+            
+                    # Set Index Offset for proper Page Display (by 3 rows)
+                    if (lastn <=2)                        Index_Max = 0;
+                    elsif ((lastn >  2) and (lastn <= 5)) Index_Max = 3;
+                    elsif ((lastn >  5) and (lastn <= 8)) Index_Max = 6;
+                    elsif ((lastn >  8) and (lastn <=11)) Index_Max = 9;
+                    elsif ((lastn > 11) and (lastn <=14)) Index_Max = 12;
+                    elsif ((lastn > 14) and (lastn <=17)) Index_Max = 15;
+                    elsif ((lastn > 17) and (lastn <=20)) Index_Max = 18;
+                    elsif ((lastn > 20) and (lastn <=23)) Index_Max = 21;
+                    elsif ((lastn > 23) and (lastn <=26)) Index_Max = 24;
+                    elsif ((lastn > 26) and (lastn <=29)) Index_Max = 27;
+        
+                    Chart_Pages = (Index_Max/3) + 1;
+
+                    # Displays Actual Chart Page/Total Pages
+                    var Page_Show = "Page " ~ getProp("/instrumentation/efb/chart/PageList") ~ "/" ~ Chart_Pages;
+                    setProp("instrumentation/efb/chart/PageShow", Page_Show);
+                    KCl0_1 = getProp("/instrumentation/efb/chart/PageShow");
+
+                    # Build 3 rows of Chart Names
+                    for (var index = 0; index <= 2; index += 1) {
+                        Index_Offset = ((getProp("/instrumentation/efb/chart/PageList") - 1) * 3);
+                        Index_Offset = Index_Offset + index;
+                        ChartDisp[index] = ChartName[Index_Offset];
+                    }
+                    # Displays 3 Chart Names [MAX Lenght = 27 chars !], ready for Selection by the Pilot
+                    setProp("instrumentation/efb/chart/Selection_0", ChartDisp[0]);
+                    setProp("instrumentation/efb/chart/Selection_1", ChartDisp[1]);
+                    setProp("instrumentation/efb/chart/Selection_2", ChartDisp[2]);
+                    KCr1 = substr(getProp("instrumentation/efb/chart/Selection_0"), 0, 26);
+                    KCr2 = substr(getProp("instrumentation/efb/chart/Selection_1"), 0, 26);
+                    KCr3 = substr(getProp("instrumentation/efb/chart/Selection_2"), 0, 26);
+                } else {
+                    KCl0 = "";
+                    KCl0_0 = "";
+                    KCl0_1 = "";
+                    KCl1 = "";
+                    KCl2 = "";
+                    KCl3 = "";
+                    KCl4 = "";
+
+                    KCr1 = "";
+                    KCr2 = "";
+                    KCr3 = "";
+                    setProp("instrumentation/efb/chart/Selection_0", "");
+                    setProp("instrumentation/efb/chart/Selection_1", "");
+                    setProp("instrumentation/efb/chart/Selection_2", "");
+                }
+                page.KCupdate();
+            }
+        } # END of 'nochart == 0' Brace
+    }
+};
+
+var efb = {
+    init : func {
+        me.UPDATE_INTERVAL = 0.05;
+        me.loopid = 0;
+        # INITIALIZE
+
+        setProp("/instrumentation/efb/page", "MENU");
+        setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+
+        # Chart Section Stuff
+
+        setProp("/instrumentation/efb/chart/type", "APT");
+        setProp("/instrumentation/efb/chart/selected", "APT_0");
+        setProp("/instrumentation/efb/VK_keypress", "");
+        setProp("/instrumentation/efb/Keyboard/CHART_Input_Line", "");
+        setProp("/instrumentation/efb/chart/rotation", 0);
+        setProp("/instrumentation/efb/diagram/rotation", 0);
+
+        AptName = getProp("/instrumentation/efb/chart/icao");
+
+        # Various Stuff
+
+        setProp("/instrumentation/efb/manual-page", 0);
+
+        setProp("/instrumentation/efb/vnav_autogen/first", 0);
+        setProp("/instrumentation/efb/vnav_autogen/gen", 0);
+        TMZ_DB_Size = getProp("/instrumentation/efb/TimeZonesDB/TMZ_DB_Size") - 1;
+        setProp("/instrumentation/efb/chart/PageList", 1);
+        me.reset();
+    },
+    searchairport : func(query) {
+        setProp("/instrumentation/gps/scratch/query", query);
+        setProp("/instrumentation/gps/scratch/type", "airport");
+        setProp("/instrumentation/gps/command", "search");
+        setProp("/instrumentation/efb/selected-rwy/id", "");
+    },
+    searchcomms : func(query) {
+        setProp("/sim/gui/dialogs/scratch/airports/selected-airport/id", query);
+        #setProp("/sim/gui/dialogs/airports/scratch/type", "airport");
+        setProp("/sim/gui/dialogs/scratch/airports/mode", "search");
+        #setProp("/instrumentation/efb/selected-rwy/id", "");
+    },
+    searchcharts : func(chart) {setProp("/sim/model/efb/chart", "Charts/" ~ chart ~ ".jpg");},
+    efbTimer : nil,
+    update : func {
+        var keypress = getProp("/instrumentation/efb/keypress");
+        var currentPage = getProp("/instrumentation/efb/page");
+        if (currentPage == "MENU") {
+            # Make sure we know the APT's ICAO
+            setProp("/instrumentation/gps/scratch/ident", getProp("/sim/airport/closest-airport-id"));
+
+            if (getProp("/instrumentation/gps/scratch/ident") != nil) setProp("/instrumentation/efb/chart/icao", sprintf("%s", getProp("/instrumentation/gps/scratch/ident")));
+            else setProp("/instrumentation/efb/chart/icao", "");
+            
+            AptName = sprintf("%s", getProp("/instrumentation/efb/chart/icao"));
+            page.clearpage();
+            page.index();
+            
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                keypress = "";
+            }
+            elsif (keypress == "l1") { 
+                setProp("/instrumentation/efb/page", "CHARTS");
+                setProp("/instrumentation/efb/chart/chartmenu", 0);
+                setProp("/instrumentation/efb/chart/zoom-in", 0);
+                ZoomFact = 0;
+                PanHFact = 0;
+                PanVFact = 0;
+                keypress = "";
+            }
+            elsif (keypress == "r1") { 
+                setProp("/sim/model/efb/page", "Displays/Video_1.jpg");
+                setProp("/instrumentation/efb/page", "VIDEO");
+                keypress = "";
+            }
+            elsif (keypress == "l2") { 
+                setProp("/sim/model/efb/page", "Displays/Performance_1.jpg");
+                setProp("/instrumentation/efb/page", "PERFORMANCE");
+                keypress = "";
+            }
+            elsif (keypress == "r2") { 
+                setProp("/sim/model/efb/page", "Displays/Documents_1.jpg");
+                setProp("/instrumentation/efb/page", "DOCUMENTS");
+                keypress = "";
+            }
+            elsif (keypress == "l4") { 
+                setProp("/sim/model/efb/page", "Displays/Airport_Info.jpg");
+                setProp("/instrumentation/efb/page", "APT INFO");
+                keypress = "";
+            }
+            elsif (keypress == "l5") { 
+                setProp("/instrumentation/efb/page", "Airport Charts");
+                keypress = "";
+            }
+            elsif (keypress == "l7") { 
+                setProp("/sim/model/efb/page", "Displays/IDENT_1.jpg");
+                setProp("/instrumentation/efb/page", "IDENT");
+                keypress = "";
+            }
+            elsif (keypress == "l8") { 
+                setProp("/sim/model/efb/page", "Displays/System_1.jpg");
+                setProp("/instrumentation/efb/page", "SYSTEMS");
+                keypress = "";
+            }
+            elsif (keypress == "r4") { 
+                #//setProp("/instrumentation/efb/page", "Airport Diagram");
+                keypress = "";
+            }
+            elsif (keypress == "r5") { 
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                keypress = "";
+            }
+            elsif (keypress == "r6") { 
+                #//setProp("/instrumentation/efb/page", "Flight Fuel Planner");
+                keypress = "";
+            }
+            elsif (keypress == "r7") { 
+                setProp("/sim/model/efb/page", "Displays/Monitor.jpg");
+                setProp("/instrumentation/efb/page", "MONITOR");
+                keypress = "";
+            }
+            elsif (keypress == "r8") { 
+                setProp("/instrumentation/efb/page", "INITIALIZE");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # CHART SECTION Parser --------------------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "CHARTS") {
+            page.clearpage();
+            #setProp("/sim/model/efb/chart", "Displays/Help_1.jpg");
+            setProp("/instrumentation/efb/diagram/rotation", 0);
+            setProp("/instrumentation/efb/diagram/chartmenu", 0);
+            setProp("/instrumentation/efb/chartsDB", "Charts/");
+            #helper = "";
+            # NOTE: this gives the Airport's name to be used on the bottom line of the Chart Display) has still to be checked: if RouteManager is not selected from the upper MENU, the property is not active...
+            AptName = getProp("/instrumentation/efb/chart/icao");
+
+            #_____________________________
+            # Chart Selection at Airport  |
+            #_____________________________|
+            
+            # Checks existence of Charts in the DB
+
+            if(ChartsList[AptName] == nil){
+                setProp("/instrumentation/efb/chart_Found", "NOT_FOUND");
+                nochart = 1;
+            }else{
+                setProp("/instrumentation/efb/chart_Found", "FOUND");
+                nochart = 0;
+            }
+            if (nochart == 0){
+                page.update();
+                if (getProp("/instrumentation/efb/chart/type") == "APT"){
+                    l[0] = "AIRPORT MAP";
+                }
+                else l[0] = "";
+            
+                l[20] = AptName;
+                efb.searchcharts(AptName ~ "/" ~ getProp("/instrumentation/efb/chart/type") ~ "/" ~ getProp("/instrumentation/efb/chart/selected"));
+                #efb.searchcharts(AptName ~ "/" ~ getProp("/instrumentation/efb/chart/type") ~ "/" ~ getProp("instrumentation/efb/chart/selection2");
+                setProp("/sim/model/efb/chart", getProp("/sim/model/efb/chart"));
+                setProp("/sim/model/efb/chart_BKUP", getProp("/sim/model/efb/chart"));
+                setProp("/sim/model/efb/Chart_2", getProp("/sim/model/efb/chart_BKUP"));
+                setProp("/sim/model/efb/Chart_4", getProp("/sim/model/efb/chart_BKUP"));
+                setProp("/sim/model/efb/Ovlay_1", "Displays/drawing.png");
+            
+                if (getProp("/instrumentation/efb/chart/chartmenu") == 0) setProp("/sim/model/efb/Ovlay_1", "Displays/drawing.png");
+                if (getProp("/instrumentation/efb/chart/chartmenu") == 1) setProp("/sim/model/efb/Ovlay_1", "Displays/drawing2.png");
+            
+            } else { 
+                setProp("/sim/model/efb/chart", "Displays/NoCharts.jpg");
+                setProp("/sim/model/efb/Ovlay_1", "Displays/drawingNULL.png");
+                helper = "Airport:    " ~ AptName;
+            }
+            # Handles the Zoom-In and Zoom-Out EFB buttons on Charts Display; available ZoomFact is 2x and 4x only.
+            if ((ZoomFact >= 0) and (ZoomFact <= 4)) {
+                if ((keypress == "Zin") and (nochart == 0)) { 
+                    ZoomFact = ZoomFact + 2;
+                    setProp("/instrumentation/efb/chart/zoom-in", ZoomFact);
+                    keypress = "";
+                }
+                elsif ((keypress == "Zout") and (nochart == 0) and (ZoomFact > 0)) { 
+                    ZoomFact = ZoomFact - 2;
+                    setProp("/instrumentation/efb/chart/zoom-in", ZoomFact);
+                    keypress = "";
+                }
+            }
+            if (ZoomFact == 0) setProp("/instrumentation/efb/chart/zoom-in", 0);
+            # Handles the Pan-Right, Pan_Left, ScrollUP and ScrollDN EFB buttons on Charts Display; Pan Horizontal Factor is 100; Pan Vertical Factor is 100.
+            if ((ZoomFact == 2) or (ZoomFact == 4)) {
+                if ((keypress == "Move_R") and (nochart == 0)) { 
+                    PanHFact = PanHFact + 100;
+                    setProp("/instrumentation/efb/chart/panH", PanHFact);
+                    keypress = "";
+                }
+                elsif ((keypress == "Move_L") and (nochart == 0)) { 
+                    PanHFact = PanHFact - 100;
+                    setProp("/instrumentation/efb/chart/panH", PanHFact);
+                    keypress = "";
+                }
+                elsif ((keypress == "ScrollUP") and (nochart == 0)) { 
+                    PanVFact = PanVFact + 100;
+                    setProp("/instrumentation/efb/chart/panV", PanVFact);
+                    keypress = "";
+                }
+                elsif ((keypress == "ScrollDN") and (nochart == 0)) { 
+                    PanVFact = PanVFact - 100;
+                    setProp("/instrumentation/efb/chart/panV", PanVFact);
+                    keypress = "";
+                }
+            } elsif (ZoomFact == 0) { 
+                setProp("/instrumentation/efb/chart/panH", -PanHFact);
+                setProp("/instrumentation/efb/chart/panV", -PanVFact);
+            }
+            # Handles Chart Rotation counter-clockwise
+            if ((keypress == "l2") and (nochart == 0) and (getProp("/instrumentation/efb/chart/chartmenu")) == 0) toggle("/instrumentation/efb/chart/rotation");
+            # Toggles Overlay Menu On/OFF
+            if ((keypress == "r8")  and (nochart == 0)) toggle("/instrumentation/efb/chart/chartmenu");
+            # Calls Virtual Keyboard for Chart DB Selection by the Pilot
+            if (keypress == "l5") { 
+                setProp("/instrumentation/efb/page", "CHARTS_KEYBOARD");
+                setProp("/instrumentation/efb/chart/zoom-in", 0);
+                setProp("/instrumentation/efb/VKDRC_keypress", "");
+                setProp("/instrumentation/efb/VK_Keyboard/Input_String", "");
+                setProp("/instrumentation/efb/chart/Searchable", 0);
+            }
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/chart/zoom-in", 0);
+                ZoomFact = 0;
+                PanHFact = -PanHFact;
+                PanVFact = -PanVFact;
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # AIRPORT INFO SECTION Parser -------------------------------------------------------------|
+        #__________________________________________________________________________________________|   
+        } elsif (currentPage == "APT INFO") {
+            
+            page.clearpage();
+            efb.searchairport(getProp("/sim/airport/closest-airport-id"));
+            efb.searchcomms(getProp("/sim/airport/closest-airport-id"));
+            page.airportinfo();
+            page.update();
+
+            # if (keypress == "r6") { 
+            #   setProp("/instrumentation/efb/page", "Runway Information");
+            #   keypress = "";
+            # }
+            if (keypress == "r8") { 
+                setProp("/instrumentation/efb/page", "CHARTS");
+                keypress = "";
+            }
+            elsif (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # MONITOR SECTION Parser ------------------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "MONITOR") {
+            page.clearpage();
+            page.FlightMonitor();
+            page.update();
+
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # VIDEO SECTION Parser --------------------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "VIDEO") {
+            page.clearpage();
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # DOCUMENTS SECTION Parser ----------------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "DOCUMENTS") {
+                page.clearpage();
+
+                if (keypress == "l3") { 
+                    setProp("/instrumentation/efb/page", "NORM PROC MANUAL");
+                    keypress = "";
+                }
+                elsif (keypress == "r2") { 
+                    setProp("/sim/model/efb/page", "Displays/Checklists_1.jpg");
+                    setProp("/instrumentation/efb/page", "CHECKLISTS");
+                    keypress = "";
+                }
+                elsif (keypress == "MENU") { 
+                    setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                    setProp("/instrumentation/efb/page", "MENU");
+                    keypress = "";
+                }
+            #__________________________________________________________________________________________
+            # PERFORMANCE SECTION Parser --------------------------------------------------------------|
+            #__________________________________________________________________________________________|
+        } elsif (currentPage == "PERFORMANCE") {
+            page.clearpage();
+
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # CHECKLISTS SECTION Parser ---------------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "CHECKLISTS") {
+            page.clearpage();
+
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+            }
+            if (keypress == "l2") { 
+                setProp("/sim/model/efb/page", "Displays/Checklists_1_1.jpg");
+                setProp("/instrumentation/efb/page", "CHECKLISTS");
+                keypress = "";
+            }
+            if (keypress == "r2") { 
+                setProp("/sim/model/efb/page", "Displays/Checklists_1_2.jpg");
+                setProp("/instrumentation/efb/page", "CHECKLISTS");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # IDENT SECTION Parser -------------------------------------------------------------------|
+        #_________________________________________________________________________________________|
+        } elsif (currentPage == "IDENT") {
+            page.clearpage();
+
+            IDENTl3 = getProp("/sim/description");
+            IDENTl4 = substr(getProp("/sim/aircraft-operator"),0,3) ~ " / " ~ substr(getProp("/sim/multiplay/callsign"), 0,6); # this is to ensure that too long 'operator' and 'callsign' data can fit into the EFB display
+            IDENTr4 = "VMEFB001"; # this is the EFb Seattle version's ID
+            IDENTl5 = substr(getProp("environment/metar/data"),0,10);
+            IDENTr5 = getProp("/instrumentation/clock/indicated-short-string") ~ "z";
+            IDENTl8 = "AIRPORT MAP DATABASE    Seattle Data    APR1214-JUN3014"; # this is the DB version, which we will periodically update with better and new Charts
+
+            setProp("/instrumentation/efb/display/IDENTline3-l", IDENTl3);
+            setProp("/instrumentation/efb/display/IDENTline4-l", IDENTl4);
+            setProp("/instrumentation/efb/display/IDENTline4-r", IDENTr4);
+            setProp("/instrumentation/efb/display/IDENTline5-l", IDENTl5);
+            setProp("/instrumentation/efb/display/IDENTline5-r", IDENTr5);
+            setProp("/instrumentation/efb/display/IDENTline8-l", IDENTl8);
+
+            setProp("/instrumentation/efb/display/input-helper", helper);
+            setProp("/instrumentation/efb/keypress", keypress);
+
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+        
+                IDENTl3 = "";
+                IDENTl4 = "";
+                IDENTr4 = "";
+                IDENTl5 = "";
+                IDENTr5 = "";
+                IDENTl8 = "";
+                setProp("/instrumentation/efb/display/IDENTline3-l", IDENTl3);
+                setProp("/instrumentation/efb/display/IDENTline4-l", IDENTl4);
+                setProp("/instrumentation/efb/display/IDENTline4-r", IDENTr4);
+                setProp("/instrumentation/efb/display/IDENTline5-l", IDENTl5);
+                setProp("/instrumentation/efb/display/IDENTline5-r", IDENTr5);
+                setProp("/instrumentation/efb/display/IDENTline8-l", IDENTl8);
+
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        #  SYSTEM SECTION Parser ------------------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "SYSTEMS") {
+            page.clearpage();
+
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+            } 
+        #__________________________________________________________________________________________
+        #  CHART SECTION Parser -------------------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "CHARTS_KEYBOARD") {
+            page.clearpage();
+            page.update();
+            page.charts_keyboard();
+
+            if (getProp("/instrumentation/efb/chart/Searchable") == 0) { 
+                setProp("/instrumentation/efb/Keyboard/CHART_Input_Line", "Enter ICAO");
+            }
+
+            # Get the ICAO to be searched for; "Virtual Keyboard" Keys Parser (see EFB_Chart_Keyboard.xml)
+
+            if ((getProp("/instrumentation/efb/VKDRC_keypress") != "") and (getProp("/instrumentation/efb/VKDRC_keypress") != "SYMB") and (getProp("/instrumentation/efb/VKDRC_keypress") != "SHIFT")) {
+                setProp("/instrumentation/efb/VK_Keyboard/Input_String", getProp("/instrumentation/efb/VK_Keyboard/Input_String") ~ getProp("/instrumentation/efb/VKDRC_keypress")); # Build the Input String  
+
+                if (getProp("/instrumentation/efb/VKDRC_keypress") == "CLEAR") { 
+            
+                    setProp("/instrumentation/efb/VK_Keyboard/Input_String", ""); # CLEARs the whole Input Field and other stuff                                     
+                }
+                if (getProp("/instrumentation/efb/VKDRC_keypress") == "BKSP") { 
+                    Temp_String = getProp("/instrumentation/efb/VK_Keyboard/Input_String"); # BACKSPACEs the Input Field
+                    lenght = size(Temp_String) - 1;
+                    setProp("/instrumentation/efb/VK_Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                    setProp("/instrumentation/efb/VKDRC_keypress", "");
+                }
+            }
+            
+            setProp("/instrumentation/efb/VKDRC_keypress", "");
+
+            TMZ_String = getProp("/instrumentation/efb/VK_Keyboard/Input_String");
+            TMZ_Input_Lenght = size(TMZ_String);
+
+            if (TMZ_Input_Lenght <= 3)  { 
+                setProp("/instrumentation/efb/Keyboard/CHART_Input_Line", getProp("/instrumentation/efb/VK_Keyboard/Input_String")); # Print it to the Keyboard Input Field
+
+            } else { 
+                setProp("/instrumentation/efb/chart/Searchable", 1);
+                setProp("/instrumentation/efb/Keyboard/CHART_Input_Line", "Press [Search IDENT] to search for: " ~ getProp("/instrumentation/efb/VK_Keyboard/Input_String"));
+            }
+            if ((getProp("/instrumentation/efb/chart/Searchable") == 1) and (keypress == "l3")) { # do SEARCH CHART
+                setProp("/instrumentation/efb/chart/icao", getProp("/instrumentation/efb/VK_Keyboard/Input_String"));
+                page.charts_keyboard();
+                setProp("/instrumentation/efb/VKDRC_keypress", "");
+                setProp("/instrumentation/efb/chart/Searchable", 0);
+                setProp("/instrumentation/efb/VK_Keyboard/Input_String", "");
+            }
+        
+            if ((keypress == "PGDN") and (getProp("/instrumentation/efb/chart/PageList") < Chart_Pages)) {
+                setProp("/instrumentation/efb/chart/SetPage", "INCREASE");
+                setProp("/instrumentation/efb/chart/PageList", getProp("/instrumentation/efb/chart/PageList") + 1);
+            }
+            if ((keypress == "PGUP") and (getProp("/instrumentation/efb/chart/PageList") > 1)) {
+                setProp("/instrumentation/efb/chart/SetPage", "INCREASE");
+                setProp("/instrumentation/efb/chart/PageList", getProp("/instrumentation/efb/chart/PageList") + 1);
+            }
+            
+            # Chart Selection - redirection to CHARTS...___________________________________________________________________________________
+
+            if (keypress == "r1") { 
+                setProp("/instrumentation/efb/chart/selected", getProp("/instrumentation/efb/chart/Selection_0"));
+                keypress = "MENU";
+            }
+            if (keypress == "r2") { 
+                setProp("/instrumentation/efb/chart/selected", getProp("/instrumentation/efb/chart/Selection_1"));
+                keypress = "MENU";
+            }
+            if (keypress == "r3") { 
+                setProp("/instrumentation/efb/chart/selected", getProp("/instrumentation/efb/chart/Selection_2"));
+                keypress = "MENU";
+            }
+            # _____________________________________________________________________________________________________________________________
+
+            if (keypress == "MENU") {
+                # setProp("/sim/model/efb/page", "Displays/Blank_Test.jpg");
+                setProp("/instrumentation/efb/chart/Status", "OFF");
+                setProp("/instrumentation/efb/VK_Chart_Type", "APT"); # This starts and re-starts the Chart_Keyboard with active ICAO/APT Chart displayed ! (see B777 EFB Manual)
+                setProp("/instrumentation/efb/VK_Keyboard/Input_String", "");
+                setProp("/instrumentation/efb/page", "CHARTS");
+                page.KCclearpage();
+                page.KCupdate();
+                keypress = "";
+            }
+            
+        #__________________________________________________________________________________________
+        #  INITIALIZE SECTION Parser --------------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "INITIALIZE") {
+            page.clearpage();
+            if (getProp("/instrumentation/efb/FlightStatus") == 0) {
+                if (getProp("/autopilot/route-manager/departure/airport") != "")
+                    OriginApt = getProp("/autopilot/route-manager/departure/airport");
+                else
+                    OriginApt = "NOT Set";
+                if (getProp("/autopilot/route-manager/destination/airport") != "")
+                    DestinationApt = getProp("/autopilot/route-manager/destination/airport");
+                else
+                    DestinationApt = "NOT Set";
+                if ((OriginApt != "NOT Set") and (DestinationApt != "NOT Set")) {
+                    OriginApt = getProp("/autopilot/route-manager/departure/airport");
+                    DestinationApt = getProp("/autopilot/route-manager/destination/airport");
+                    setProp("/sim/model/efb/page", "Displays/Initialize_1.jpg");
+                    ClosingFlightFlag = 1; # Flight INITIABLE
+                } else {
+                    setProp("/sim/model/efb/page", "Displays/Initialize_2.jpg");
+                    setProp("/instrumentation/efb/FlightStatus", 0);
+                    ClosingFlightFlag = 0; # Flight NOT INITIABLE
+                }
+            } elsif ((getProp("/instrumentation/efb/FlightStatus") == 1) and (ClosingFlightFlag == 2)) {
+                setProp("/instrumentation/efb/FlightStatus", 1); # Flight ACTIVE and CLOSABLE
+                FlightStatus = 1;
+                setProp("/sim/model/efb/page", "Displays/Initialize_3.jpg");
+            }
+        
+            INITl4 = OriginApt;
+            INITl5 = DestinationApt;
+            setProp("/instrumentation/efb/display/INITline4-l", INITl4);
+            setProp("/instrumentation/efb/display/INITline5-l", INITl5);
+        
+            if ((keypress == "r8") and (ClosingFlightFlag == 1)) { 
+                setProp("/instrumentation/efb/FlightStatus", 1); # Flight INITIATED
+                ClosingFlightFlag = 2; # Flight CLOSABLE
+                keypress = "";
+            }
+            if ((keypress == "r8") and (FlightStatus == 1)) { 
+                setProp("/instrumentation/efb/FlightStatus", 0); # Flight NOT ACTIVE
+                setProp("/sim/model/efb/page", "Displays/Initialize_5.jpg");
+                FlightStatus = 0;
+                ClosingFlightFlag = 0; # Flight CLOSED
+                keypress = "";
+            }
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+                INITl4 = "";
+                INITl5 = "";
+                setProp("/instrumentation/efb/display/INITline4-l", INITl4);
+                setProp("/instrumentation/efb/display/INITline5-l", INITl5);
+                keypress = "";
+            }
+            
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES SECTION Parser ----------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "UTILITIES") {
+            page.clearpage();
+            setProp("/instrumentation/efb/Keyboard/Input_String", "");
+            setProp("/instrumentation/efb/Keyboard/Input_Line", "");
+            setProp("/instrumentation/efb/Keyboard/Input_Line2", "");
+            setProp("/instrumentation/efb/Keyboard/Input_Line3", "");
+            setProp("/instrumentation/efb/VK_keypress", "");
+            
+            if (keypress == "l3") {
+                setProp("/instrumentation/efb/page", "UTILITIES_DESC_RATE");
+                setProp("/sim/model/efb/page", "Displays/PU_DRC.jpg");
+                setProp("/instrumentation/efb/Keyboard/Input_String", "");
+                setProp("/instrumentation/efb/VK_keypress", "");
+                setProp("/instrumentation/efb/Input_Unit", "NO_INPUT");
+                setProp("/instrumentation/efb/DRC_Initial_FL", "300");
+                setProp("/instrumentation/efb/DRC_Target_FL", "30");
+                setProp("/instrumentation/efb/DRC_Initial_GS", "250");
+                setProp("/instrumentation/efb/DRC_Target_GS", "200");
+                setProp("/instrumentation/efb/DRC_Distance", "50");
+                setProp("/instrumentation/efb/DRC_Initial_FL_MEM", getProp("/instrumentation/efb/DRC_Initial_FL"));
+                setProp("/instrumentation/efb/DRC_Target_FL_MEM", getProp("/instrumentation/efb/DRC_Target_FL"));
+                setProp("/instrumentation/efb/DRC_Initial_GS_MEM", getProp("/instrumentation/efb/DRC_Initial_GS"));
+                setProp("/instrumentation/efb/DRC_Target_GS_MEM", getProp("/instrumentation/efb/DRC_Target_GS"));
+                setProp("/instrumentation/efb/DRC_Distance_MEM", getProp("/instrumentation/efb/DRC_Distance"));
+                VK_Key = "";
+                #setProp("/instrumentation/efb/VK_DRC_MarkerL", 1);
+                Initial_FL = 300;
+                Target_FL = 30;
+                Initial_GS = 250;
+                Target_GS = 200;
+                DRC_Distance = 50;
+                keypress = "";
+            }
+            if (keypress == "l4") {
+                setProp("/instrumentation/efb/page", "GPS POSITION");
+            }
+            if (keypress == "r1") {
+                setProp("/instrumentation/efb/page", "UTILITIES_CNV_SPD");
+                setProp("/sim/model/efb/page", "Displays/PU_Cnv_Spd.jpg");
+                setProp("/instrumentation/efb/VK_keypress", "");
+                setProp("/instrumentation/efb/VK_IN_Marker", 1);
+                setProp("/instrumentation/efb/VK_OUT_Marker", 1);
+                VK_Input_Mem = 0;
+                VK_Output_Mem = 0;
+            }
+            if (keypress == "r2") {
+                setProp("/instrumentation/efb/page", "UTILITIES_CNV_LNG");
+                setProp("/sim/model/efb/page", "Displays/PU_Cnv_Lng.jpg");
+                setProp("/instrumentation/efb/VK_keypress", "");
+                setProp("/instrumentation/efb/VK_IN_Marker", 1);
+                setProp("/instrumentation/efb/VK_OUT_Marker", 1);
+                VK_Input_Mem = 0;
+                VK_Output_Mem = 0;
+            }
+            if (keypress == "r3") {
+                setProp("/instrumentation/efb/page", "UTILITIES_CNV_WGT");
+                setProp("/sim/model/efb/page", "Displays/PU_Cnv_Wgt.jpg");
+                setProp("/instrumentation/efb/VK_keypress", "");
+                setProp("/instrumentation/efb/VK_IN_Marker", 1);
+                setProp("/instrumentation/efb/VK_OUT_Marker", 1);
+                VK_Input_Mem = 0;
+                VK_Output_Mem = 0;
+                }
+            if (keypress == "r4") {
+                setProp("/instrumentation/efb/page", "UTILITIES_CNV_TMP");
+                setProp("/sim/model/efb/page", "Displays/PU_Cnv_Tmp.jpg");
+                setProp("/instrumentation/efb/VK_keypress", "");
+                setProp("/instrumentation/efb/VK_IN_Marker", 1);
+                setProp("/instrumentation/efb/VK_OUT_Marker", 1);
+                VK_Input_Mem = 0;
+                VK_Output_Mem = 0;
+            }
+            if (keypress == "r5") {
+                setProp("/instrumentation/efb/page", "UTILITIES_CNV_VLM");
+                setProp("/sim/model/efb/page", "Displays/PU_Cnv_Vlm.jpg");
+                setProp("/instrumentation/efb/VK_keypress", "");
+                setProp("/instrumentation/efb/VK_IN_Marker", 1);
+                setProp("/instrumentation/efb/VK_OUT_Marker", 1);
+                VK_Input_Mem = 0;
+                VK_Output_Mem = 0;
+            }
+            if (keypress == "r6") {
+                setProp("/instrumentation/efb/page", "UTILITIES_CNV_TMZ");
+                setProp("/sim/model/efb/page", "Displays/PU_Cnv_Tmz.jpg");
+                setProp("/instrumentation/efb/VK_keypress", "");
+                setProp("/instrumentation/efb/VK_IN_Marker", 1);
+                setProp("/instrumentation/efb/VK_OUT_Marker", 1);
+                setProp("/instrumentation/efb/Keyboard/Input_String","");
+                setProp("/instrumentation/efb/Keyboard/Input_HH", "--");
+                setProp("/instrumentation/efb/Keyboard/Input_MM", "--");
+                setProp("/instrumentation/efb/Keyboard/Output_HH", "");
+                setProp("/instrumentation/efb/Keyboard/Output_MM", "");
+                setProp("/instrumentation/efb/page/Cnv_Fact", "0");
+                TMZ_String = "";
+                TMZ_Index = 0;
+
+                #Parsing for Month's names
+
+                TMZ_DATE = substr(getProp("environment/metar/data"), 5, 5);
+
+                if (substr(TMZ_DATE, 0, 2) == "01") TMZ_DATE = "JAN" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "02") TMZ_DATE = "FEB" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "03") TMZ_DATE = "MAR" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "04") TMZ_DATE = "APR" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "05") TMZ_DATE = "MAY" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "06") TMZ_DATE = "JUN" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "07") TMZ_DATE = "JUL" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "08") TMZ_DATE = "AUG" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "09") TMZ_DATE = "SEP" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "10") TMZ_DATE = "OCT" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "11") TMZ_DATE = "NOV" ~ substr(TMZ_DATE, 2, 3);
+                if (substr(TMZ_DATE, 0, 2) == "12") TMZ_DATE = "DEC" ~ substr(TMZ_DATE, 2, 3);
+            }
+        
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Main_Menu.jpg");
+                setProp("/instrumentation/efb/page", "MENU");
+                keypress = "";
+            }
+            
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - GPS POSITION ----------------------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "GPS POSITION") {
+            page.clearpage();
+            page.gps();
+        
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                keypress = "";
+            }
+            
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - SPEED CONVERSION Parser -----------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "UTILITIES_CNV_SPD") {
+            Input_Unit = getProp("/instrumentation/efb/VK_IN_Marker");
+            Output_Unit = getProp("/instrumentation/efb/VK_OUT_Marker");
+
+            # Input keys Check
+
+            if (getProp("/instrumentation/efb/VK_keypress") != "" or (Input_Unit != VK_Input_Mem) or (Output_Unit != VK_Output_Mem)) {
+                # Input Field Parser
+                if (getProp("/instrumentation/efb/VK_keypress") == "CLEAR") { 
+                    setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                if (getProp("/instrumentation/efb/VK_keypress") == "BKSP") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # BACKSPACEs the Input Field
+                    lenght = size(Temp_String) - 1;
+                    setProp("/instrumentation/efb/Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                if (getProp("/instrumentation/efb/VK_keypress") == "CHNGS") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # CHANGEs SIGN to the Input Field
+                    if (substr(Temp_String, 0, 1) == "-") { 
+                        lenght = size(Temp_String) - 1;
+                        Temp_String = substr(Temp_String, 1, lenght);
+                    } else { 
+                        Temp_String = "-" ~ Temp_String;
+                    }
+                    setProp("/instrumentation/efb/Keyboard/Input_String", Temp_String);
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                
+                # Input Field Display
+
+                setProp("/instrumentation/efb/Keyboard/Input_String", getProp("/instrumentation/efb/Keyboard/Input_String") ~ getProp("/instrumentation/efb/VK_keypress")); # Build the Input String
+                setProp("/instrumentation/efb/Keyboard/Input_Line", getProp("/instrumentation/efb/Keyboard/Input_String"));                                                 # Print it to the Keyboard Input Field
+
+                # ---------------> Conversion Table Selection
+                # ---------------> Input Unit 1 () FT/M ---> Output Unit: FT/M, KM/H, KT, MTS, MPH
+                if (Input_Unit == 1) {
+                    if (Output_Unit == 1)    Cnv_Fact = 1;
+                    elsif (Output_Unit == 2) Cnv_Fact = 0.018288;
+                    elsif (Output_Unit == 3) Cnv_Fact = 0.0098747;
+                    elsif (Output_Unit == 4) Cnv_Fact = 0.0050800;
+                    elsif (Output_Unit == 5) {
+                        if (getProp("/instrumentation/efb/VK_keypress") == "CLEAR") { 
+                            setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field
+                            setProp("/instrumentation/efb/VK_keypress", "");
+                        }
+                        elsif (getProp("/instrumentation/efb/VK_keypress") == "BKSP") { 
+                            Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # BACKSPACEs the Input Field
+                            lenght = size(Temp_String) - 1;
+                            setProp("/instrumentation/efb/Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                            setProp("/instrumentation/efb/VK_keypress", "");
+                        }
+                        elsif (getProp("/instrumentation/efb/VK_keypress") == "CHNGS") { 
+                            Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # CHANGEs SIGN to the Input Field
+                            if (substr(Temp_String, 0, 1) == "-") { 
+                                lenght = size(Temp_String) - 1;
+                                Temp_String = substr(Temp_String, 1, lenght);
+                            } else { 
+                                Temp_String = "-" ~ Temp_String;
+                            }
+                            setProp("/instrumentation/efb/Keyboard/Input_String", Temp_String);
+                            setProp("/instrumentation/efb/VK_keypress", "");
+                        }
+                        Cnv_Fact = 0.011364;
+                    }
+                }
+                # ---------------> Input Unit 2 () KM/H ---> Output Unit: FT/M, KM/H, KT, MTS, MPH
+                elsif (Input_Unit == 2) {
+                    if (Output_Unit == 1)    Cnv_Fact = 54.68066;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1;
+                    elsif (Output_Unit == 3) Cnv_Fact = 0.5399568;
+                    elsif (Output_Unit == 4) Cnv_Fact = 0.2777778;
+                    elsif (Output_Unit == 5) Cnv_Fact = 0.6213712;
+                }
+                # ---------------> Input Unit 3 () KT ---> Output Unit: FT/M, KM/H, KT, MTS, MPH
+                elsif (Input_Unit == 3) {
+                    if (Output_Unit == 1)    Cnv_Fact = 101.2686;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1.852000;
+                    elsif (Output_Unit == 3) Cnv_Fact = 1;
+                    elsif (Output_Unit == 4) Cnv_Fact = 0.5144444;
+                    elsif (Output_Unit == 5) Cnv_Fact = 1.150779;
+                }
+                # ---------------> Input Unit 4 () MTS ---> Output Unit: FT/M, KM/H, KT, MTS, MPH
+                elsif (Input_Unit == 4) {
+                    if (Output_Unit == 1)    Cnv_Fact = 196.85;
+                    elsif (Output_Unit == 2) Cnv_Fact = 3.6000;
+                    elsif (Output_Unit == 3) Cnv_Fact = 1.9438;
+                    elsif (Output_Unit == 4) Cnv_Fact = 1;
+                    elsif (Output_Unit == 5) Cnv_Fact = 2.2369;
+                }
+                # ---------------> Input Unit 5 () MPH ---> Output Unit: FT/M, KM/H, KT, MTS, MPH
+                elsif (Input_Unit == 5) {
+                    if (Output_Unit == 1)    Cnv_Fact = 88.0002;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1.609344;
+                    elsif (Output_Unit == 3) Cnv_Fact = 0.8689762;
+                    elsif (Output_Unit == 4) Cnv_Fact = 0.4470400;
+                    elsif (Output_Unit == 5) Cnv_Fact = 1;
+                }
+                VK_Input_Mem = Input_Unit;
+                VK_Output_Mem = Output_Unit;
+                
+                # Output Field Display
+
+                if ((getProp("/instrumentation/efb/Keyboard/Input_Line") == "") or (getProp("/instrumentation/efb/Keyboard/Input_Line") == ".") or (getProp("/instrumentation/efb/Keyboard/Input_Line") == "-")) { 
+                    setProp("/instrumentation/efb/Keyboard/Output_Line", "");
+                } else {
+                    Output_Line = getProp("/instrumentation/efb/Keyboard/Input_Line");
+                    Output_Line = Output_Line * Cnv_Fact; # Build the Input String
+                    setProp("/instrumentation/efb/Keyboard/Output_Line", Output_Line); # Print it to the Keyboard Output Field
+                }
+                setProp("/instrumentation/efb/VK_keypress", "");
+            }
+            
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                setProp("/instrumentation/efb/Keyboard/Input_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Output_Line", "");
+                keypress = "";
+            }
+        
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - LENGHT CONVERSION Parser ----------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "UTILITIES_CNV_LNG") {
+
+            Input_Unit = getProp("/instrumentation/efb/VK_IN_Marker");
+            Output_Unit = getProp("/instrumentation/efb/VK_OUT_Marker");
+
+            # Input keys Check
+
+            if (getProp("/instrumentation/efb/VK_keypress") != "" or (Input_Unit != VK_Input_Mem) or (Output_Unit != VK_Output_Mem)) {
+                # Input Field Parser
+
+                if (getProp("/instrumentation/efb/VK_keypress") == "CLEAR") {
+                    setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "BKSP") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # BACKSPACEs the Input Field
+                    lenght = size(Temp_String) - 1;
+                    setProp("/instrumentation/efb/Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "CHNGS") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # CHANGEs SIGN to the Input Field
+                    if (substr(Temp_String, 0, 1) == "-") { 
+                        lenght = size(Temp_String) - 1;
+                        Temp_String = substr(Temp_String, 1, lenght);
+                    } else { 
+                        Temp_String = "-" ~ Temp_String;
+                    }
+                    setProp("/instrumentation/efb/Keyboard/Input_String", Temp_String);
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+
+                # Input Field Display
+
+                setProp("/instrumentation/efb/Keyboard/Input_String", getProp("/instrumentation/efb/Keyboard/Input_String") ~ getProp("/instrumentation/efb/VK_keypress")); # Build the Input String
+                setProp("/instrumentation/efb/Keyboard/Input_Line", getProp("/instrumentation/efb/Keyboard/Input_String")); # Print it to the Keyboard Input Field
+
+                # ---------------> Conversion Table Selection
+
+                # ---------------> Input Unit 1 () FEET ---> Output Unit: FEET, KILOMETERS, METERS, NAUTICAL MILES, STATUTE MILES
+                if (Input_Unit == 1) {
+                    if (Output_Unit == 1)    Cnv_Fact = 1;
+                    elsif (Output_Unit == 2) Cnv_Fact = 0.0003048;
+                    elsif (Output_Unit == 3) Cnv_Fact = 0.30480;
+                    elsif (Output_Unit == 4) Cnv_Fact = 0.000164579; # International and US Nautical Miles, NOT UK Nautical Miles !!
+                    elsif (Output_Unit == 5) Cnv_Fact = 0.000189394; # International Statute Miles
+                }
+                # ---------------> Input Unit 2 () KILOMETERS ---> Output Unit: FEET, KILOMETERS, METERS, NAUTICAL MILES, STATUTE MILES
+                elsif (Input_Unit == 2) {
+                    if (Output_Unit == 1) Cnv_Fact = 3280.83989501;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1;
+                    elsif (Output_Unit == 3) Cnv_Fact = 1000;
+                    elsif (Output_Unit == 4) Cnv_Fact = 0.539956803456; # International and US Nautical Miles, NOT UK Nautical Miles !!
+                    elsif (Output_Unit == 5) Cnv_Fact = 0.621371192237; # International Statute Miles
+                }
+                # ---------------> Input Unit 3 () METERS ---> Output Unit: FEET, KILOMETERS, METERS, NAUTICAL MILES, STATUTE MILES
+                elsif (Input_Unit == 3) {
+                    if (Output_Unit == 1)    Cnv_Fact = 3.28083989501;
+                    elsif (Output_Unit == 2) Cnv_Fact = 0.001;
+                    elsif (Output_Unit == 3) Cnv_Fact = 1;
+                    elsif (Output_Unit == 4) Cnv_Fact = 0.000539956803456; # International and US Nautical Miles, NOT UK Nautical Miles !!
+                    elsif (Output_Unit == 5) Cnv_Fact = 0.000621371192237; # International Statute Miles
+                }
+                # ---------------> Input Unit 4 () NAUTICAL MILES (INTERNATIONAL!) ---> Output Unit: FEET, KILOMETERS, METERS, NAUTICAL MILES, STATUTE MILES
+                elsif (Input_Unit == 4) {
+                    if (Output_Unit == 1)    Cnv_Fact = 6076.11548556;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1.852;
+                    elsif (Output_Unit == 3) Cnv_Fact = 1852;
+                    elsif (Output_Unit == 4) Cnv_Fact = 1;
+                    elsif (Output_Unit == 5) Cnv_Fact = 1.15077944802; # International Statute Miles
+                }
+                # ---------------> Input Unit 5 () STATUTE MILES ---> Output Unit: FEET, KILOMETERS, METERS, NAUTICAL MILES, STATUTE MILES
+                elsif (Input_Unit == 5) {
+                    if (Output_Unit == 1)    Cnv_Fact = 5280;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1.609344;
+                    elsif (Output_Unit == 3) Cnv_Fact = 1609.344;
+                    elsif (Output_Unit == 4) Cnv_Fact = 0.868976241901; # International and US Nautical Miles, NOT UK Nautical Miles !!
+                    elsif (Output_Unit == 5) Cnv_Fact = 1;
+                }
+                VK_Input_Mem = Input_Unit;
+                VK_Output_Mem = Output_Unit;
+            
+                # Output Field Display
+                if ((getProp("/instrumentation/efb/Keyboard/Input_Line") == "") or (getProp("/instrumentation/efb/Keyboard/Input_Line") == ".") or (getProp("/instrumentation/efb/Keyboard/Input_Line") == "-")) { 
+                    setProp("/instrumentation/efb/Keyboard/Output_Line", "");
+                } else { 
+                    Output_Line = getProp("/instrumentation/efb/Keyboard/Input_Line");
+                    Output_Line = Output_Line * Cnv_Fact; # Build the Input String
+                    setProp("/instrumentation/efb/Keyboard/Output_Line", Output_Line); # Print it to the Keyboard Output Field
+                }
+                setProp("/instrumentation/efb/VK_keypress", "");
+            }
+
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                setProp("/instrumentation/efb/Keyboard/Input_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Output_Line", "");
+                keypress = "";
+            }
+        
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - WEIGHT CONVERSION Parser ----------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "UTILITIES_CNV_WGT") {
+            Input_Unit = getProp("/instrumentation/efb/VK_IN_Marker");
+            Output_Unit = getProp("/instrumentation/efb/VK_OUT_Marker");
+            
+            # Input keys Check
+            if (getProp("/instrumentation/efb/VK_keypress") != "" or (Input_Unit != VK_Input_Mem) or (Output_Unit != VK_Output_Mem)) {
+                # Input Field Parser
+                if (getProp("/instrumentation/efb/VK_keypress") == "CLEAR") { 
+                    setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "BKSP") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # BACKSPACEs the Input Field
+                    lenght = size(Temp_String) - 1;
+                    setProp("/instrumentation/efb/Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "CHNGS") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # CHANGEs SIGN to the Input Field
+                    if (substr(Temp_String, 0, 1) == "-") { 
+                        lenght = size(Temp_String) - 1;
+                        Temp_String = substr(Temp_String, 1, lenght);
+                    } else { 
+                        Temp_String = "-" ~ Temp_String;
+                    }
+                    setProp("/instrumentation/efb/Keyboard/Input_String", Temp_String);
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+        
+                # Input Field Display
+                setProp("/instrumentation/efb/Keyboard/Input_String", getProp("/instrumentation/efb/Keyboard/Input_String") ~ getProp("/instrumentation/efb/VK_keypress")); # Build the Input String
+                setProp("/instrumentation/efb/Keyboard/Input_Line2", getProp("/instrumentation/efb/Keyboard/Input_String"));                                                # Print it to the Keyboard Input Field
+
+                # ---------------> Conversion Table Selection
+                # ---------------> Input Unit 1 () KILOGRAMS ---> Output Unit: KILOGRAMS, POUNDS
+                if (Input_Unit == 1) {
+                    if (Output_Unit == 1)    Cnv_Fact = 1;
+                    elsif (Output_Unit == 2) Cnv_Fact = 2.20462262185;
+                }
+                # ---------------> Input Unit 2 () POUNDS ---> Output Unit: KILOGRAMS, POUNDS
+                elsif (Input_Unit == 2) {
+                    if (Output_Unit == 1)    Cnv_Fact = 0.45359237;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1;
+                }
+                VK_Input_Mem = Input_Unit;
+                VK_Output_Mem = Output_Unit;
+            
+                # Output Field Display
+                if ((getProp("/instrumentation/efb/Keyboard/Input_Line2") == "") or (getProp("/instrumentation/efb/Keyboard/Input_Line2") == ".") or (getProp("/instrumentation/efb/Keyboard/Input_Line2") == "-")) { 
+                    setProp("/instrumentation/efb/Keyboard/Output_Line2", "");
+                } else { 
+                    Output_Line2 = getProp("/instrumentation/efb/Keyboard/Input_Line2");
+                    Output_Line2 = Output_Line2 * Cnv_Fact; # Build the Input String
+                    setProp("/instrumentation/efb/Keyboard/Output_Line2", Output_Line2); # Print it to the Keyboard Output Field
+                }
+                setProp("/instrumentation/efb/VK_keypress", "");
+            }
+
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                setProp("/instrumentation/efb/Keyboard/Input_Line2", "");
+                setProp("/instrumentation/efb/Keyboard/Output_Line2", "");
+                keypress = "";
+            }
+       
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - TEMPERATURE CONVERSION Parser -----------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "UTILITIES_CNV_TMP") {
+
+            Input_Unit = getProp("/instrumentation/efb/VK_IN_Marker");
+            Output_Unit = getProp("/instrumentation/efb/VK_OUT_Marker");
+
+            # Input keys Check
+            if (getProp("/instrumentation/efb/VK_keypress") != "" or (Input_Unit != VK_Input_Mem) or (Output_Unit != VK_Output_Mem)) {
+                # Input Field Parser
+                if (getProp("/instrumentation/efb/VK_keypress") == "CLEAR") { 
+                    setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "BKSP") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # BACKSPACEs the Input Field
+                    lenght = size(Temp_String) - 1;
+                    setProp("/instrumentation/efb/Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "CHNGS") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # CHANGEs SIGN to the Input Field
+                    if (substr(Temp_String, 0, 1) == "-") { 
+                        lenght = size(Temp_String) - 1;
+                        Temp_String = substr(Temp_String, 1, lenght);
+                    } else { 
+                        Temp_String = "-" ~ Temp_String;
+                    }
+                    setProp("/instrumentation/efb/Keyboard/Input_String", Temp_String);
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                # Input Field Display
+                setProp("/instrumentation/efb/Keyboard/Input_String", getProp("/instrumentation/efb/Keyboard/Input_String") ~ getProp("/instrumentation/efb/VK_keypress")); # Build the Input String
+                setProp("/instrumentation/efb/Keyboard/Input_Line2", getProp("/instrumentation/efb/Keyboard/Input_String"));                                                # Print it to the Keyboard Input Field
+
+                # Output Field Display
+                if ((getProp("/instrumentation/efb/Keyboard/Input_Line2") == "") or (getProp("/instrumentation/efb/Keyboard/Input_Line2") == ".") or (getProp("/instrumentation/efb/Keyboard/Input_Line2") == "-")) { 
+                    setProp("/instrumentation/efb/Keyboard/Output_Line2", "");
+                } else { 
+                    Output_Line2 = getProp("/instrumentation/efb/Keyboard/Input_Line2");
+                    # ---------------> Conversion Table Selection
+                    # ---------------> Input Unit 1 () CELSIUS (�C) ---> Output Unit: CELSIUS (�C), FAHRENHEIT (�F)
+                    if (Input_Unit == 1) {
+                        if (Output_Unit == 1)    Cnv_Fact = Output_Line2;
+                        elsif (Output_Unit == 2) Cnv_Fact = (Output_Line2*1.8) + 32;
+                    }
+                    # ---------------> Input Unit 2 () FAHRENHEIT (�F) ---> Output Unit: CELSIUS (�C), FAHRENHEIT (�F)
+                    elsif (Input_Unit == 2) {
+                        if (Output_Unit == 1)    Cnv_Fact = (Output_Line2 - 32)/1.8;
+                        elsif (Output_Unit == 2) Cnv_Fact = Output_Line2;
+                    }
+                    VK_Input_Mem = Input_Unit;
+                    VK_Output_Mem = Output_Unit;
+
+                    Output_Line2 = Cnv_Fact; # Build the Input String
+                    setProp("/instrumentation/efb/Keyboard/Output_Line2", Output_Line2); # Print it to the Keyboard Output Field
+                }
+                setProp("/instrumentation/efb/VK_keypress", "");
+            }
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                setProp("/instrumentation/efb/Keyboard/Input_Line2", "");
+                setProp("/instrumentation/efb/Keyboard/Output_Line2", "");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - VOLUME CONVERSION Parser ----------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "UTILITIES_CNV_VLM") {
+
+            Input_Unit = getProp("/instrumentation/efb/VK_IN_Marker");
+            Output_Unit = getProp("/instrumentation/efb/VK_OUT_Marker");
+            Output_TMZ_Line = "";
+            # Input keys Check
+            if (getProp("/instrumentation/efb/VK_keypress") != "" or (Input_Unit != VK_Input_Mem) or (Output_Unit != VK_Output_Mem)) {
+                # Input Field Parser
+                if (getProp("/instrumentation/efb/VK_keypress") == "CLEAR") { 
+                    setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "BKSP") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # BACKSPACEs the Input Field
+                    lenght = size(Temp_String) - 1;
+                    setProp("/instrumentation/efb/Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "CHNGS") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # CHANGEs SIGN to the Input Field
+                    if (substr(Temp_String, 0, 1) == "-") { 
+                        lenght = size(Temp_String) - 1;
+                        Temp_String = substr(Temp_String, 1, lenght);
+                    } else { 
+                        Temp_String = "-" ~ Temp_String;
+                    }
+                    setProp("/instrumentation/efb/Keyboard/Input_String", Temp_String);
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                # Input Field Display
+                setProp("/instrumentation/efb/Keyboard/Input_String", getProp("/instrumentation/efb/Keyboard/Input_String") ~ getProp("/instrumentation/efb/VK_keypress")); # Build the Input String
+                setProp("/instrumentation/efb/Keyboard/Input_Line3", getProp("/instrumentation/efb/Keyboard/Input_String")); # Print it to the Keyboard Input Field
+            
+                # ---------------> Conversion Table Selection
+                # ---------------> Input Unit 1 () IMPERIAL GALLONS ---> Output Unit: IMPERIAL GALLONS, US GALLONS, LITERS
+                if (Input_Unit == 1) {
+                    if (Output_Unit == 1)    Cnv_Fact = 1;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1.20095;
+                    elsif (Output_Unit == 3) Cnv_Fact = 4.54609;
+                }
+                # ---------------> Input Unit 2 () US GALLONS ---> Output Unit: IMPERIAL GALLONS, US GALLONS, LITERS
+                elsif (Input_Unit == 2) {
+                    if (Output_Unit == 1)    Cnv_Fact = 0.832674;
+                    elsif (Output_Unit == 2) Cnv_Fact = 1;
+                    elsif (Output_Unit == 3) Cnv_Fact = 3.78541;
+                }
+                # ---------------> Input Unit 3 () LITERS ---> Output Unit: IMPERIAL GALLONS, US GALLONS, LITERS
+                elsif (Input_Unit == 3) {
+                    if (Output_Unit == 1)    Cnv_Fact = 0.219969;
+                    elsif (Output_Unit == 2) Cnv_Fact = 0.264172;
+                    elsif (Output_Unit == 3) Cnv_Fact = 1;
+                }
+                VK_Input_Mem = Input_Unit;
+                VK_Output_Mem = Output_Unit;
+                # Output Field Display
+                if ((getProp("/instrumentation/efb/Keyboard/Input_Line3") == "") or (getProp("/instrumentation/efb/Keyboard/Input_Line3") == ".") or (getProp("/instrumentation/efb/Keyboard/Input_Line3") == "-")) { 
+                    setProp("/instrumentation/efb/Keyboard/Output_Line3", "");
+                } else { 
+                    Output_Line2 = getProp("/instrumentation/efb/Keyboard/Input_Line3");
+                    Output_Line2 = Output_Line2 * Cnv_Fact; # Build the Input String
+                    setProp("/instrumentation/efb/Keyboard/Output_Line3", Output_Line2); # Print it to the Keyboard Output Field
+                }
+                setProp("/instrumentation/efb/VK_keypress", "");
+            }
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                setProp("/instrumentation/efb/Keyboard/Input_Line3", "");
+                setProp("/instrumentation/efb/Keyboard/Output_Line3", "");
+                keypress = "";
+            }
+        
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - TIME ZONE CONVERSION Parser -------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "UTILITIES_CNV_TMZ") {
+            
+            TMZ_TIME = getProp("/instrumentation/clock/indicated-short-string") ~ "z";
+            setProp("/instrumentation/efb/Keyboard/Current_DT_Line", TMZ_DATE ~ " " ~ TMZ_TIME);                                                                                                                # Print Current Date & Time
+            setProp("/instrumentation/efb/Keyboard/Converted_Name_Line", "Use Keyboard to Input Time (HHMM)");
+            # Input keys Check
+
+            if (getProp("/instrumentation/efb/VK_keypress") != "") {
+                # Input Field Parser
+                if (getProp("/instrumentation/efb/VK_keypress") == "CLEAR") { 
+                    setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field and other stuff
+                    setProp("/instrumentation/efb/Keyboard/Input_HH_Line", "--");
+                    setProp("/instrumentation/efb/Keyboard/Input_MM_Line", "--");
+                    setProp("/instrumentation/efb/Keyboard/Input_Zulu_Line", "--:--");
+                    setProp("/instrumentation/efb/Keyboard/Output_HH", "");
+                    setProp("/instrumentation/efb/Keyboard/Output_MM", "");
+                    setProp("/instrumentation/efb/Keyboard/Converted_ID_Line", "");
+                    setProp("/instrumentation/efb/Keyboard/Converted_Name_Line", "Use Keyboard to Input Time (HHMM)");
+                    setProp("/instrumentation/efb/Keyboard/Output_TMZ_Line", "--:--");
+                    setProp("/instrumentation/efb/Keyboard/Cnv_Fact", "");
+                    TMZ_index = 0;
+                    Output_TMz_Line = "--:--";
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "BKSP") { 
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # BACKSPACEs the Input Field
+                    lenght = size(Temp_String) - 1;
+                    setProp("/instrumentation/efb/Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "CHNGS") { 
+                    setProp("/instrumentation/efb/Keyboard/Input_String", getProp("/instrumentation/efb/Keyboard/Input_String"));                     # Bypasses CHANGEs SIGN
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                
+                # Input Field Display
+                TMZ_String = getProp("/instrumentation/efb/Keyboard/Input_String");
+                TMZ_Input_Lenght = size(TMZ_String);
+
+                if (TMZ_Input_Lenght <= 3)  {
+                    setProp("/instrumentation/efb/Keyboard/Input_String", getProp("/instrumentation/efb/Keyboard/Input_String") ~ getProp("/instrumentation/efb/VK_keypress"));                                 # Build the Input String
+
+                    if (TMZ_Input_Lenght > 1) { 
+                        setProp("/instrumentation/efb/Keyboard/Input_HH_Line", substr(getProp("/instrumentation/efb/Keyboard/Input_String"), 0, 2));                                    # IF 3rd digit, Print HH to the Keyboard Input Field
+                        setProp("/instrumentation/efb/Keyboard/Output_HH", substr(getProp("/instrumentation/efb/Keyboard/Input_String"), 0, 2));                                                                    # Copy HH to Output_HH
+                        setProp("/instrumentation/efb/Keyboard/Input_MM_Line", substr(getProp("/instrumentation/efb/Keyboard/Input_String"), 2, TMZ_Input_Lenght));                                                 # IF 3rd digit, Print MM to the Keyboard Input Field
+                        setProp("/instrumentation/efb/Keyboard/Output_MM", substr(getProp("/instrumentation/efb/Keyboard/Input_String"), 2, TMZ_Input_Lenght));                                                     # Copy MM to Output_MM
+                        setProp("/instrumentation/efb/Keyboard/Input_Zulu_Line", (getProp("/instrumentation/efb/Keyboard/Input_HH_Line") ~ ":" ~ getProp("/instrumentation/efb/Keyboard/Input_MM_Line")));          # IF 3rd digit, Print "zulu Time" to the Keyboard Output "zulu to be converted" Field (see EFB Manual)
+                    } else { 
+                        setProp("/instrumentation/efb/Keyboard/Input_HH_Line", getProp("/instrumentation/efb/Keyboard/Input_String"));                                                                                                                         # Print Blank HH to the Keyboard Input Field
+                        setProp("/instrumentation/efb/Keyboard/Input_MM_Line", "--");                                                                                                                      # Print Blank HH to the Keyboard Input Field
+                        setProp("/instrumentation/efb/Keyboard/Input_Zulu_Line", getProp("/instrumentation/efb/Keyboard/Input_HH_Line") ~ ":" ~ getProp("/instrumentation/efb/Keyboard/Input_MM_Line"));   # Print Blank "zulu Time" to the Keyboard Output "zulu to be converted" Field (see EFB Manual)                                                                                                                          # Print "" MM to the Keyboard Input Field
+                        setProp("/instrumentation/efb/Keyboard/Output_HH", "");
+                        setProp("/instrumentation/efb/Keyboard/Output_MM", "");
+                    }
+
+                } # an 'else' clause should be set here, giving the Pilot an audible 'WARNING Beep', because we cannot accept more than 4 chars for Time Input!
+            }
+            setProp("/instrumentation/efb/VK_keypress", ""); # reset the VK keys to ""
+
+            # ---------------> Output Unit: Input Time Conversion --> TIME ZONES Time
+
+            if (TMZ_Input_Lenght > 1) { 
+                # TMZ_Index = TMZ_Index;
+                if ((keypress == "r3") and (TMZ_Index > 0)) { 
+                    TMZ_Index = TMZ_Index - 1;
+                    keypress = "";
+                } # an 'else' clause should be set here, giving the Pilot an audible 'WARNING Beep', because he reached Bottom End of DB File!
+                if ((keypress == "r4") and (TMZ_Index < TMZ_DB_Size)) { 
+                    TMZ_Index = TMZ_Index + 1;
+                    keypress = "";
+                } # an 'else' clause should be set here, giving the Pilot an audible 'WARNING Beep', because he reached Top End of DB File!
+                #setProp("/instrumentation/efb/Keyboard/Output_HH", "12");
+                #setProp("/instrumentation/efb/Keyboard/Output_MM", "54");
+                if (keypress == "r5") { setProp("/instrumentation/efb/Keyboard/Cnv_Fact", "0"); # RESET ALL
+                    setProp("/instrumentation/efb/Keyboard/Input_String", "");
+                    TMZ_String = "";
+                    TMZ_Index = 0;
+                    TMZ_Input_Lenght = 0;
+                    setProp("/instrumentation/efb/Keyboard/Current_DT_Line", "");
+                    setProp("/instrumentation/efb/Keyboard/Input_HH_Line", "");
+                    setProp("/instrumentation/efb/Keyboard/Input_MM_Line", "");
+                    setProp("/instrumentation/efb/Keyboard/Input_Zulu_Line", "");
+                    setProp("/instrumentation/efb/Keyboard/Output_HH", "0");
+                    setProp("/instrumentation/efb/Keyboard/Output_MM", "0");
+                    setProp("/instrumentation/efb/Keyboard/Converted_ID_Line", "");
+                    setProp("/instrumentation/efb/Keyboard/Converted_Name_Line", "Use Keyboard to Input Time (HHMM)");
+                    setProp("/instrumentation/efb/Keyboard/Output_TMZ_Line", "");
+                    setProp("/instrumentation/efb/Keyboard/Cnv_Fact", "0");
+                    TMZ_index = 0;
+                    Output_TMz_Line = "--:--";
+                }
+                if (getProp("/instrumentation/efb/Keyboard/Output_HH") != "0") {
+                    TMZ_Converted_ID = getProp("/instrumentation/efb/TimeZonesDB/IDX[" ~ TMZ_Index ~ "]/ID");
+                    TMZ_Converted_Name = getProp("/instrumentation/efb/TimeZonesDB/IDX[" ~ TMZ_Index ~ "]/Name");
+                    TMZ_zulu_HH = getProp("/instrumentation/efb/Keyboard/Output_HH");
+                    TMZ_Converted_OffSet = getProp("/instrumentation/efb/TimeZonesDB/IDX[" ~ TMZ_Index ~ "]/OffSet");
+                    setProp("/instrumentation/efb/Keyboard/Converted_ID_Line", TMZ_Converted_ID); # Print Time Zone ID to the Keyboard Converted Time Field
+                    setProp("/instrumentation/efb/Keyboard/Converted_Name_Line", TMZ_Converted_Name); # Print Time Zone Name to the Keyboard Converted Time Field
+                    setProp("/instrumentation/efb/Keyboard/Cnv_Fact", (TMZ_zulu_HH + TMZ_Converted_OffSet));
+                } else { 
+                    setProp("/instrumentation/efb/Keyboard/Cnv_Fact", 0);
+                }
+                # HH Corrections for Time Zone's Conversion Factors
+                if (getProp("/instrumentation/efb/Keyboard/Cnv_Fact") > 9) { 
+                    setProp("/instrumentation/efb/Keyboard/Cnv_Fact", getProp("/instrumentation/efb/Keyboard/Cnv_Fact"));                                                                              # Print HH Converted Time to the Keyboard Converted Time Field
+                } elsif (((getProp("/instrumentation/efb/Keyboard/Cnv_Fact") >= 0) and (getProp("/instrumentation/efb/Keyboard/Cnv_Fact") <= 9))) { 
+                    setProp("/instrumentation/efb/Keyboard/Cnv_Fact", "0" ~ getProp("/instrumentation/efb/Keyboard/Cnv_Fact")); # Print H Converted Time to the Keyboard Converted Time Field
+                } elsif (getProp("/instrumentation/efb/Keyboard/Cnv_Fact") < 0) { 
+                    setProp("/instrumentation/efb/Keyboard/Cnv_Fact", (24 + getProp("/instrumentation/efb/Keyboard/Cnv_Fact")));                                                                  # Print (24 - HH) Converted Time to the Keyboard Converted Time Field
+                }
+            } else { 
+                setProp("/instrumentation/efb/Keyboard/Cnv_Fact", "--");
+            }
+            # Output Converted Time Field Display
+            if ((getProp("/instrumentation/efb/Keyboard/Input_HH_Line") == "") or (getProp("/instrumentation/efb/Keyboard/Input_HH_Line") == ".") or (getProp("/instrumentation/efb/Keyboard/Input_HH_Line") == "--")) { 
+                setProp("/instrumentation/efb/Keyboard/Output_TMZ_Line", "");
+                Output_TMz_Line = "--:--";
+            } else { 
+                Output_TMZ_Line = getProp("/instrumentation/efb/Keyboard/Cnv_Fact");
+                Output_TMZ_Line = substr(Output_TMZ_Line, 0, 2) ~ ":" ~ getProp("/instrumentation/efb/Keyboard/Output_MM");# Build the Output String
+            }
+            setProp("/instrumentation/efb/Keyboard/Output_TMZ_Line", Output_TMZ_Line); # Print it to the Keyboard Output Converted Time Field
+            
+            if (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                setProp("/instrumentation/efb/Keyboard/Current_DT_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Input_HH_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Input_MM_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Input_Zulu_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Cnv_Fact", "");
+                setProp("/instrumentation/efb/Keyboard/Output_HH", "");
+                setProp("/instrumentation/efb/Keyboard/Output_MM", "");
+                setProp("/instrumentation/efb/Keyboard/Converted_ID_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Converted_Name_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Output_TMZ_Line", "");
+                setProp("/instrumentation/efb/Keyboard/Input_String", "");
+
+                keypress = "";
+            }  
+        
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - DESCENT RATE Calculator ----------------------------------------------|
+        #_________________________________________________________________________________________|
+        } elsif (currentPage == "UTILITIES_DESC_RATE") {
+            
+            page.clearpage();
+            # Input keys Check
+            if (keypress == "l2") { 
+                setProp("/instrumentation/efb/Input_Unit", "Initial_FL");
+                setProp("/instrumentation/efb/Keyboard/Input_String","");
+                setProp("/instrumentation/efb/DRC_Initial_FL_MEM", getProp("/instrumentation/efb/DRC_Initial_FL"));
+                setProp("/instrumentation/efb/VK_DRC_MarkerL", 1);
+                setProp("/instrumentation/efb/VK_DRC_MarkerR", 0);
+            }
+            elsif (keypress == "r2") { 
+                setProp("/instrumentation/efb/Input_Unit", "Target_FL");
+                setProp("/instrumentation/efb/Keyboard/Input_String","");
+                setProp("/instrumentation/efb/DRC_Target_FL_MEM", getProp("/instrumentation/efb/DRC_Target_FL"));
+                setProp("/instrumentation/efb/VK_DRC_MarkerR", 1);
+                setProp("/instrumentation/efb/VK_DRC_MarkerL", 0);
+            }
+            elsif (keypress == "l3") { 
+                setProp("/instrumentation/efb/Input_Unit", "Initial_GS");
+                setProp("/instrumentation/efb/Keyboard/Input_String","");
+                setProp("/instrumentation/efb/DRC_Initial_GS_MEM", getProp("/instrumentation/efb/DRC_Initial_GS"));
+                setProp("/instrumentation/efb/VK_DRC_MarkerL", 2);
+                setProp("/instrumentation/efb/VK_DRC_MarkerR", 0);
+            }
+            elsif (keypress == "r3") { 
+                setProp("/instrumentation/efb/Input_Unit", "Target_GS");
+                setProp("/instrumentation/efb/Keyboard/Input_String","");
+                setProp("/instrumentation/efb/DRC_Target_GS_MEM", getProp("/instrumentation/efb/DRC_Target_GS"));
+                setProp("/instrumentation/efb/VK_DRC_MarkerR", 2);
+                setProp("/instrumentation/efb/VK_DRC_MarkerL", 0);
+            }
+            elsif (keypress == "l4") { 
+                setProp("/instrumentation/efb/Input_Unit", "Distance");
+                setProp("/instrumentation/efb/Keyboard/Input_String","");
+                setProp("/instrumentation/efb/DRC_Distance_MEM", getProp("/instrumentation/efb/DRC_Distance"));
+                setProp("/instrumentation/efb/VK_DRC_MarkerL", 3);
+                setProp("/instrumentation/efb/VK_DRC_MarkerR", 0);
+            }
+            
+            # Input keys Parser
+            if ((getProp("/instrumentation/efb/VK_keypress") != "") and (getProp("/instrumentation/efb/VK_keypress") != ".") and (getProp("/instrumentation/efb/VK_keypress") != "CHNGS") and (getProp("/instrumentation/efb/Input_Unit") != "NO_INPUT")) {
+                if (getProp("/instrumentation/efb/VK_keypress") == "CLEAR") { 
+                    setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field
+                    VK_Key = "VOID";
+                    setProp("/instrumentation/efb/VK_keypress", "");
+                }
+                elsif (getProp("/instrumentation/efb/VK_keypress") == "BKSP") {
+                    Temp_String = getProp("/instrumentation/efb/Keyboard/Input_String"); # BACKSPACEs the Input Field
+                    lenght = size(Temp_String) - 1;
+                    if (lenght >= 1) {
+                        setProp("/instrumentation/efb/Keyboard/Input_String", substr(Temp_String, 0, lenght));
+                        setProp("/instrumentation/efb/VK_keypress", "");
+                    } elsif (lenght <= 0) { 
+                        setProp("/instrumentation/efb/Keyboard/Input_String", ""); # CLEARs the whole Input Field
+                        VK_Key = "VOID";
+                    }
+                }
+                DRC_String = getProp("/instrumentation/efb/Keyboard/Input_String");
+                DRC_Input_Lenght = size(DRC_String);
+            
+                if (DRC_Input_Lenght < 3) {
+                    if (VK_Key != "VOID") { 
+                        setProp("/instrumentation/efb/Keyboard/Input_String", getProp("/instrumentation/efb/Keyboard/Input_String") ~ getProp("/instrumentation/efb/VK_keypress"));                 # Build the Input String...
+                    }
+                    if ((getProp("/instrumentation/efb/Input_Unit") == "Initial_FL") and (VK_Key != "VOID")) { 
+                        setProp("/instrumentation/efb/DRC_Initial_FL", getProp("/instrumentation/efb/Keyboard/Input_String"));   # ...For Initial FL
+                    } elsif ((getProp("/instrumentation/efb/Input_Unit") == "Initial_FL") and (VK_Key == "VOID")) { 
+                        setProp("/instrumentation/efb/display/DRC_l3", "CLEAR");
+                        setProp("/instrumentation/efb/DRC_Initial_FL", getProp("/instrumentation/efb/DRC_Initial_FL_MEM"));
+                    }
+                    if ((getProp("/instrumentation/efb/Input_Unit") == "Target_FL") and (VK_Key != "VOID")) { 
+                        setProp("/instrumentation/efb/DRC_Target_FL", getProp("/instrumentation/efb/Keyboard/Input_String"));     # ...For Target FL
+                    } elsif ((getProp("/instrumentation/efb/Input_Unit") == "Target_FL") and (VK_Key == "VOID")) { 
+                        setProp("/instrumentation/efb/display/DRC_r3", "CLEAR");
+                        setProp("/instrumentation/efb/DRC_Target_FL", getProp("/instrumentation/efb/DRC_Target_FL_MEM"));
+                    }
+                    if ((getProp("/instrumentation/efb/Input_Unit") == "Initial_GS") and (VK_Key != "VOID")) { 
+                        setProp("/instrumentation/efb/DRC_Initial_GS", getProp("/instrumentation/efb/Keyboard/Input_String"));   # ...For Initial GS
+                    } elsif ((getProp("/instrumentation/efb/Input_Unit") == "Initial_GS") and (VK_Key == "VOID")) { 
+                        setProp("/instrumentation/efb/display/DRC_l5", "CLEAR");
+                        setProp("/instrumentation/efb/DRC_Initial_GS", getProp("/instrumentation/efb/DRC_Initial_GS_MEM"));
+                    }
+                    if ((getProp("/instrumentation/efb/Input_Unit") == "Target_GS") and (VK_Key != "VOID")) { 
+                        setProp("/instrumentation/efb/DRC_Target_GS", getProp("/instrumentation/efb/Keyboard/Input_String"));     # ...For Target GS
+                    } elsif ((getProp("/instrumentation/efb/Input_Unit") == "Target_GS") and (VK_Key == "VOID")) { 
+                        setProp("/instrumentation/efb/display/DRC_r5", "CLEAR");
+                        setProp("/instrumentation/efb/DRC_Target_GS", getProp("/instrumentation/efb/DRC_Target_GS_MEM"));
+                    }
+                    if ((getProp("/instrumentation/efb/Input_Unit") == "Distance")  and (VK_Key != "VOID")) { 
+                        setProp("/instrumentation/efb/DRC_Distance", getProp("/instrumentation/efb/Keyboard/Input_String"));      # ...For Distance
+                    } elsif ((getProp("/instrumentation/efb/Input_Unit") == "Distance")  and (VK_Key == "VOID")) { 
+                        setProp("/instrumentation/efb/display/DRC_l7", "CLEAR");
+                        setProp("/instrumentation/efb/DRC_Distance", getProp("/instrumentation/efb/DRC_Distance_MEM"));
+                    }
+                }
+            }
+            setProp("/instrumentation/efb/VK_keypress", ""); # reset the VK keys to ""
+            VK_Key = "";
+            
+            # Transfers Values to DRC variables as numbers
+            Initial_FL = num(getProp("/instrumentation/efb/DRC_Initial_FL"));
+            Target_FL = num(getProp("/instrumentation/efb/DRC_Target_FL"));
+            Initial_GS = num(getProp("/instrumentation/efb/DRC_Initial_GS"));
+            Target_GS = num(getProp("/instrumentation/efb/DRC_Target_GS"));
+            DRC_Distance = num(getProp("/instrumentation/efb/DRC_Distance"));
+            
+            # Calculates Formulas
+            # Formula: [Angle of Descent (ft/NM) = ALT Gradient/Distance] |||| [SPD Factor (ft/min) = SPD Gradient/60] |||| [Target Descent Rate (Fpm) = Angle of Descent * SPD Factor]
+
+            var DRC_Angle = (Target_FL - Initial_FL)/DRC_Distance;
+            var DRC_AvgSpeed = (Initial_GS + Target_GS)/2;
+            var DRC_Fact = DRC_AvgSpeed/60;
+            var DRC_Output = DRC_Angle * DRC_Fact*100;
+            var DRC_Time = (Target_FL - Initial_FL)/(DRC_Output/100);
+            
+            # Prepares Output Strings
+            DRC_l3 = substr(getProp("/instrumentation/efb/DRC_Initial_FL"), 0, 3);
+            CUT = split(".", DRC_l3);
+            DRC_l3 = CUT[0];
+
+            DRC_r3 = substr(getProp("/instrumentation/efb/DRC_Target_FL"), 0, 3);
+            CUT = split(".", DRC_r3);
+            DRC_r3 = CUT[0];
+
+            DRC_l5 = substr(getProp("/instrumentation/efb/DRC_Initial_GS"), 0, 3);
+            CUT = split(".", DRC_l5);
+            DRC_l5 = CUT[0];
+
+            DRC_r5 = substr(getProp("/instrumentation/efb/DRC_Target_GS"), 0, 3);
+            CUT = split(".", DRC_r5);
+            DRC_r5 = CUT[0];
+
+            DRC_l7 = substr(getProp("/instrumentation/efb/DRC_Distance"), 0, 3);
+            CUT = split(".", DRC_l7);
+            DRC_l7 = CUT[0];
+
+            setProp("/instrumentation/efb/DRC_Output", "100");
+            setProp("/instrumentation/efb/DRC_Output", DRC_Output);
+            DRC_r8 = substr(getProp("/instrumentation/efb/DRC_Output"), 0, 8);
+            CUT = split(".", DRC_r8);
+            DRC_r8 = CUT[0];
+
+            setProp("/instrumentation/efb/DRC_Angle", "100");
+            setProp("/instrumentation/efb/DRC_Angle", DRC_Angle);
+            DRC_r9 = substr(getProp("/instrumentation/efb/DRC_Angle"), 0, 5);
+            # CUT = split(".", DRC_r9);
+            # DRC_r9 = CUT[0];
+
+            setProp("/instrumentation/efb/DRC_Time", "100");
+            setProp("/instrumentation/efb/DRC_Time", DRC_Time);
+            DRC_r10 = substr(getProp("/instrumentation/efb/DRC_Time"), 0, 5);
+            #CUT = split(".", DRC_r10);
+            #DRC_r10 = CUT[0];
+
+            
+            page.DRCupdate();   # Displays Output
+
+            if (keypress == "MENU") { 
+                page.DRCclearpage();
+                page.DRCupdate();
+                setProp("/sim/model/efb/page", "Displays/PU_1.jpg");
+                setProp("/instrumentation/efb/VK_DRC_MarkerR", 0);
+                setProp("/instrumentation/efb/VK_DRC_MarkerL", 0);
+                setProp("/instrumentation/efb/page", "UTILITIES");
+                keypress = "";
+            }
+        #__________________________________________________________________________________________
+        # PILOT UTILITIES - NORMAL PROCEDURES MANUAL ----------------------------------------------|
+        #__________________________________________________________________________________________|
+        } elsif (currentPage == "NORM PROC MANUAL") {
+            page.clearpage();
+
+            if (keypress == "PGUP") { 
+                setProp("/instrumentation/efb/manual-page", getProp("/instrumentation/efb/manual-page") - 0.20);
+                keypress = "";
+            }
+            elsif (keypress == "ScrollUP") { 
+                setProp("/instrumentation/efb/manual-page", getProp("/instrumentation/efb/manual-page") - 0.02);
+                keypress = "";
+            }
+            elsif (keypress == "ScrollDN") { 
+                setProp("/instrumentation/efb/manual-page", getProp("/instrumentation/efb/manual-page") + 0.02);
+                keypress = "";
+            }
+            elsif (keypress == "PGDN") { 
+                setProp("/instrumentation/efb/manual-page", getProp("/instrumentation/efb/manual-page") + 0.20);
+                keypress = "";
+            }
+            elsif (keypress == "MENU") { 
+                setProp("/sim/model/efb/page", "Displays/Documents_1.jpg");
+                setProp("/instrumentation/efb/page", "DOCUMENTS");
+                keypress = "";
+            }
+        }
+        #___________________________________________________________________________________________
+        #_______________________________END of Parsers & SubParsers_________________________________|
+        page.update();
+        if ((getProp("/instrumentation/efb/page") == "Airport Charts") or (getProp("/instrumentation/efb/page") == "Airport Diagram") or (getProp("/instrumentation/efb/page") == "NORM PROC MANUAL")) setProp("/instrumentation/efb/text-color", 0);
+        else setProp("/instrumentation/efb/text-color", 1);
+    },
+    reset : func {
+        if(!me.efbTimer)
+            me.efbTimer = maketimer(me.UPDATE_INTERVAL, func me.update());
+        else
+            me.efbTimer.stop();
+        me.loopid += 1;
+        #//me._loop_(me.loopid);
+        me.efbTimer.start();
+    },
+    #//_loop_ : func() {
+    #//    id == me.loopid or return;
+    #//    me.update();
+    #//}
+};
+
+var toggle = func(property) {
+    if (getProp(property) == 1)
+        setProp(property, 0);
+    else
+        setProp(property, 1);
+}
+setlistener("sim/signals/fdm-initialized", func {efb.init();});
diff --git a/test/final.nas b/test/final.nas
new file mode 100644
index 0000000..ac5d13c
--- /dev/null
+++ b/test/final.nas
@@ -0,0 +1,210 @@
+var smartScreen = canvas.new({
+  "name": "smartScreen",   # The name is optional but allow for easier identification
+  "size": [2048, 2048], # Size of the underlying texture (should be a power of 2, required) [Resolution]
+  "view": [768, 768],  # Virtual resolution (Defines the coordinate system of the canvas [Dimensions]
+                        # which will be stretched the size of the texture, required)
+  "mipmapping": 1       # Enable mipmapping (optional)
+});
+
+smartScreen.addPlacement({"node": "screen", "texture": "screen.jpeg"});
+var group = smartScreen.createGroup();
+
+# Create a text element and set some values
+var text = group.createChild("text", "optional-id-for element")
+          .setTranslation(10, 20)      # The origin is in the top left corner
+          .setAlignment("left-center") # All values from osgText are supported (see $FG_ROOT/Docs/README.osgtext)
+          .setFont("LiberationFonts/LiberationSans-Regular.ttf") # Fonts are loaded either from $AIRCRAFT_DIR/Fonts or $FG_ROOT/Fonts
+          .setFontSize(14, 1.2)        # Set fontsize and optionally character aspect ratio
+          .setColor(1,0,0)             # Text color
+          .setText("This is a text element");
+text.hide();
+text.setText("SELF TEST NORMAL").show();
+
+
+
+var ui_root = smartScreen.createGroup();
+var vbox = canvas.VBoxLayout.new();
+smartScreen.setLayout(vbox);
+
+
+var button_onl = canvas.gui.widgets.Button.new(ui_root, canvas.style, {}).setText("Online OSM").listen("clicked", func showOnlineMap());
+var button_offl = canvas.gui.widgets.Button.new(ui_root, canvas.style, {}).setText("Offline OSM").listen("clicked", func showOfflineMap());
+button_onl.setSizeHint([32, 128]);
+button_offl.setSizeHint([32, 128]);
+
+var label = canvas.gui.widgets.Label.new(ui_root, canvas.style, {});
+
+var button_box = canvas.HBoxLayout.new();
+button_box.addItem(button_onl);
+button_box.addItem(button_offl);
+button_box.addItem(label);
+button_box.addStretch(1);
+
+vbox.addItem(button_box);
+vbox.addStretch(1);
+
+
+var showOnlineMap = func(){
+  TestMap.show();
+  g.hide();
+  label.setText("Online Mode");
+}
+
+
+var showOfflineMap = func(){
+  TestMap.hide();
+  g.show();
+  label.setText("Offline Mode");
+}
+
+
+# Online Map using MapStructure
+var TestMap = smartScreen.createGroup().createChild("map");
+TestMap.setTranslation(smartScreen.get("view[0]")/2,smartScreen.get("view[1]")/2);
+
+
+var ctrl_ns = canvas.Map.Controller.get("Aircraft position");
+var source = ctrl_ns.SOURCES["map-dialog"];
+if (source == nil) {
+  # TODO: amend
+  var source = ctrl_ns.SOURCES["map-dialog"] = {
+    getPosition: func subvec(geo.aircraft_position().latlon(), 0, 2),# ? ? ?
+    getAltitude: func getprop('/position/altitude-ft'),
+    getHeading:  func {
+      if (me.aircraft_heading)
+        getprop('/orientation/heading-deg');
+      else
+        0;
+    },
+    aircraft_heading: 1,
+  };
+}
+setlistener("/sim/gui/dialogs/map-canvas/aircraft-heading-up", func(n){source.aircraft_heading = n.getBoolValue();}, 1);
+TestMap.setController("Aircraft position", "map-dialog");
+TestMap.setRange(1); 
+
+var r = func(name,vis=1,zindex=nil){return caller(0)[0];};
+# TODO: we'll need some z-indexing here, right now it's just random
+
+foreach(var type; [r('APS')] ){
+    TestMap.addLayer(factory: canvas.SymbolLayer, type_arg: type.name, visible: type.vis, priority: 2);
+}
+
+foreach(var type; [ r('OSM')]) {
+    TestMap.addLayer(factory: canvas.OverlayLayer,
+                    type_arg: type.name,
+                     visible: type.vis,
+                    priority: 1);
+}
+
+
+TestMap.hide();
+
+# Offline map
+
+var g = smartScreen.createGroup();
+var zoom = 15;
+var type = "intl";
+var tile_size = 256;
+
+
+var changeZoom = func(d)
+{
+  zoom = math.max(2, math.min(19, zoom + d));
+  updateTiles();
+}
+
+# http://polymaps.org/docs/
+# https://github.com/simplegeo/polymaps
+# https://github.com/Leaflet/Leaflet
+
+var maps_base = getprop("/sim/fg-home") ~ '/cache/maps';
+
+var makePath =
+string.compileTemplate(maps_base ~ '/osm-{type}/{z}/{x}/{y}.jpg');
+var num_tiles = [4, 4];
+
+var center_tile_offset = [(num_tiles[0]-1)/2, (num_tiles[1]-1)/ 2];
+
+# simple aircraft icon at current position/center of the map
+g.createChild("path")
+  .moveTo( tile_size*center_tile_offset[0]-10, tile_size*center_tile_offset[1])
+  .horiz(20)
+  .move(-10,-10)
+  .vert(20)
+  .set("stroke", "red")
+  .set("stroke-width", 2)
+  .set("z-index", 1);
+
+# initialize the map by setting up
+# a grid of raster images  
+
+var tiles = setsize([], num_tiles[0]);
+for(var x=0; x<num_tiles[0]; x+=1)
+{
+  tiles[x] = setsize([], num_tiles[1]);
+  for(var y=0; y<num_tiles[1]; y+=1)
+    tiles[x][y] = g.createChild("image", "map-tile");
+}
+
+var last_tile = [-1,-1];
+var last_type = type;
+
+# this is the callback that will be regularly called by the timer
+# to update the map
+var updateTiles = func()
+{
+  # get current position
+  var lat = getprop('/position/latitude-deg');
+  var lon = getprop('/position/longitude-deg');
+
+  var n = math.pow(2, zoom);
+  var offset = [n*((lon+180)/360)-center_tile_offset[0], (1-math.ln(math.tan(lat*math.pi/180)+1/math.cos(lat*math.pi/180))/math.pi)/2*n-center_tile_offset[1]];
+  var tile_index = [int(offset[0]), int(offset[1])];
+
+  var ox = tile_index[0] - offset[0];
+  var oy = tile_index[1] - offset[1];
+
+  for(var x = 0; x < num_tiles[0]; x += 1)
+    for(var y = 0; y < num_tiles[1]; y += 1)
+      tiles[x][y].setTranslation(int((ox + x) * tile_size + 0.5), int((oy + y) * tile_size + 0.5));
+
+  if(  tile_index[0] != last_tile[0]
+    or tile_index[1] != last_tile[1]
+    or type != last_type )
+  {
+    for(var x = 0; x < num_tiles[0]; x += 1)
+      for(var y = 0; y < num_tiles[1]; y += 1)
+      {
+        var pos = {
+          z: zoom,
+          x: int(offset[0] + x),
+          y: int(offset[1] + y),
+          type: type
+        };
+
+        (func {
+            var img_path = makePath(pos);
+            var tile = tiles[x][y];
+            print('loading ' ~ img_path);
+            tile.set("src", img_path);
+          })();
+        # lambda
+      }
+
+      last_tile = tile_index;
+      last_type = type;
+  }
+};
+
+# set up a timer that will invoke updateTiles at 2-second intervals
+var update_timer = maketimer(2, updateTiles);
+# actually start the timer
+update_timer.start();
+
+# set up default zoom level
+changeZoom(0);
+
+#g.hide();
+
+
diff --git a/test/final2.nas b/test/final2.nas
new file mode 100644
index 0000000..4d71d3a
--- /dev/null
+++ b/test/final2.nas
@@ -0,0 +1,643 @@
+###############################################################################
+##
+## Nasal module for dual control over the multiplayer network.
+##
+##  Copyright (C) 2007 - 2010  Anders Gidenstam  (anders(at)gidenstam.org)
+##  This file is licensed under the GPL license version 2 or later.
+##
+###############################################################################
+## MP properties
+var lat_mpp     = "position/latitude-deg";
+var lon_mpp     = "position/longitude-deg";
+var alt_mpp     = "position/altitude-ft";
+var heading_mpp = "orientation/true-heading-deg";
+var pitch_mpp   = "orientation/pitch-deg";
+var roll_mpp    = "orientation/roll-deg";
+
+# Import components from the mp_broadcast module.
+var Binary         = mp_broadcast.Binary;
+var MessageChannel = mp_broadcast.MessageChannel;
+
+###############################################################################
+# Utility classes
+
+############################################################
+# Translate a property into another.
+#  Factor and offsets are only used for numeric values.
+#   src    - source      : property node
+#   dest   - destination : property node
+#   factor -             : double
+#   offset -             : double
+var Translator = {};
+Translator.new = func (src = nil, dest = nil, factor = 1, offset = 0) {
+  var obj = { parents   : [Translator],
+              src       : src,
+              dest      : dest,
+              factor    : factor,
+              offset    : offset };
+  if (obj.src == nil or obj.dest == nil) {
+    print("Translator[");
+    print("  ", debug.string(obj.src));
+    print("  ", debug.string(obj.dest));
+    print("]");
+    fail();
+  }
+
+  return obj;
+}
+Translator.update = func () {
+  var v = me.src.getValue();
+  if (is_num(v)) {
+    me.dest.setValue(me.factor * v + me.offset);
+  } else {
+    if (typeof(v) == "scalar")
+      me.dest.setValue(v);
+  }
+}
+
+############################################################
+# Detects flanks on two insignals encoded in a property.
+# - positive signal up/down flank
+# - negative signal up/down flank
+#   n                 - source : property node
+#   on_positive_flank - action : func (v)
+#   on_negative_flank - action : func (v)
+var EdgeTrigger = {};
+EdgeTrigger.new = func (n, on_positive_flank, on_negative_flank) {
+  var obj = { parents   : [EdgeTrigger],
+              old       : 0,
+              node      : n, 
+              pos_flank : on_positive_flank,
+              neg_flank : on_negative_flank };
+  if (obj.node == nil) {
+    print("EdgeTrigger[");
+    print("  ", debug.string(obj.node));
+    print("]");
+    fail();
+  }
+  return obj;
+}
+EdgeTrigger.update = func {
+  # NOTE: float MP properties get interpolated.
+  #       This detector relies on that steady state is reached between
+  #       flanks.
+  var val = me.node.getValue();
+  if (!is_num(val)) return;
+  if (me.old == 1) {
+    if (val < me.old) {
+      me.pos_flank(0);
+    }
+  } elsif (me.old == 0) {
+    if (val > me.old) {
+      me.pos_flank(1);
+    } elsif (val < me.old) {
+      me.neg_flank(1);
+    }
+  } elsif (me.old == -1) {
+    if (val > me.old) {
+      me.neg_flank(0);
+    }
+  }
+  me.old = val;
+}
+
+############################################################
+# StableTrigger: Triggers an action when a MPP property
+#                becomes stable (i.e. doesn't change for
+#                MIN_STABLE seconds).
+#   src     - MP prop : property node
+#   action  - action to take when the value becomes stable : [func(v)]
+# An action is triggered when value has stabilized.
+var StableTrigger = {};
+StableTrigger.new = func (src, action) {
+  var obj = { parents      : [StableTrigger],
+              src          : src,
+              action       : action,
+              old          : 0,
+              stable_since : 0,
+              wait         : 0,
+              MIN_STABLE   : 0.01 };
+  # Error checking.
+  var bad = (obj.src == nil) or (action = nil);
+
+  if (bad) {
+    print("StableTrigger[");
+    print("  ", debug.string(obj.src));
+    print("  ", debug.string(obj.action));
+    print("]");
+    fail();
+  }
+
+  return obj;
+}
+StableTrigger.update = func () {
+  var v   = me.src.getValue();
+  if (!is_num(v)) return;
+  var t = getprop("/sim/time/elapsed-sec"); # NOTE: simulated time.
+
+  if ((me.old == v) and
+      ((t - me.stable_since) > me.MIN_STABLE) and (me.wait == 1)) {
+    # Trigger action.
+    me.action(v);
+
+    me.wait = 0;
+  } elsif (me.old == v) {
+    # Wait. This is either before the signal is stable or after the action. 
+  } else {
+    me.stable_since = t;
+    me.wait         = 1;
+    me.old          = me.src.getValue();
+  }
+}
+
+############################################################
+# Selects the most recent value of two properties.
+#   src1      -  : property node
+#   src2      -  : property node
+#   dest      -  : property node
+#   threshold -  : double
+var MostRecentSelector = {};
+MostRecentSelector.new = func (src1, src2, dest, threshold) {
+  var obj = { parents   : [MostRecentSelector],
+              old1      : 0,
+              old2      : 0,
+              src1      : src1,
+              src2      : src2,
+              dest      : dest,
+              thres     : threshold };
+  if (obj.src1 == nil or obj.src2 == nil or obj.dest == nil) {
+    print("MostRecentSelector[");
+    print("  ", debug.string(obj.src1));
+    print("  ", debug.string(obj.src2));
+    print("  ", debug.string(obj.dest));
+    print("]");
+  }
+
+  return obj;
+}
+MostRecentSelector.update = func {
+  var v1 = me.src1.getValue();
+  var v2 = me.src2.getValue();
+  if (!is_num(v1) and !is_num(v2)) return;
+  elsif (!is_num(v1)) me.dest.setValue(v2);
+  elsif (!is_num(v2)) me.dest.setValue(v1);
+  else {
+      if (abs (v2 - me.old2) > me.thres) {
+          me.old2 = v2;
+          me.dest.setValue(me.old2);
+      }
+      if (abs (v1 - me.old1) > me.thres) {
+          me.old1 = v1;
+          me.dest.setValue(me.old1);
+      }
+  }
+}
+
+############################################################
+# Adds two input properties.
+#   src1      -  : property node
+#   src2      -  : property node
+#   dest      -  : property node
+var Adder = {};
+Adder.new = func (src1, src2, dest) {
+  var obj = { parents : [DeltaAccumulator],
+              src1    : src1,
+              src2    : src2,
+              dest    : dest };
+  if (obj.src1 == nil or obj.src2 == nil or obj.dest == nil) {
+    print("Adder[");
+    print("  ", debug.string(obj.src1));
+    print("  ", debug.string(obj.src2));
+    print("  ", debug.string(obj.dest));
+    print("]");
+    fail();
+  }
+
+  return obj;
+}
+Adder.update = func () {
+  var v1 = me.src1.getValue();
+  var v2 = me.src2.getValue();
+  if (!is_num(v1) or !is_num(v2)) return;
+  me.dest.setValue(v1 + v2);
+}
+
+############################################################
+# Adds the delta of src to dest.
+#   src       -  : property node
+#   dest      -  : property node
+var DeltaAdder = {};
+DeltaAdder.new = func (src, dest) {
+  var obj = { parents : [DeltaAdder],
+              old     : 0,
+              src     : src,
+              dest    : dest };
+  if (obj.src == nil or obj.dest == nil) {
+    print("DeltaAdder[", debug.string(obj.src), ", ",
+          debug.string(obj.dest), "]");
+    fail();
+  }
+
+  return obj;
+}
+DeltaAdder.update = func () {
+  var v = me.src.getValue();
+  if (!is_num(v)) return;
+  me.dest.setValue((v - me.old) + me.dest.getValue());
+  me.old = v;
+}
+
+############################################################
+# Switch encoder: Encodes upto 32 boolean properties in one
+# int property.
+#   inputs    - list of property nodes
+#   dest      - where the bitmask is stored : property node
+var SwitchEncoder = {};
+SwitchEncoder.new = func (inputs, dest) {
+  var obj = { parents : [SwitchEncoder],
+              inputs  : inputs,
+              dest    : dest };
+  # Error checking.
+  var bad = (obj.dest == nil);
+  foreach (var i; inputs) {
+    if (i == nil) { bad = 1; }
+  }
+
+  if (bad) {
+    print("SwitchEncoder[");
+    foreach (var i; inputs) {
+      print("  ", debug.string(i));
+    }
+    print("  ", debug.string(obj.dest));
+    print("]");
+    fail();
+  }
+
+  return obj;
+}
+SwitchEncoder.update = func () {
+  var v = 0;
+  var b = 1;
+  forindex (var i; me.inputs) {
+    if (me.inputs[i].getBoolValue()) {
+      v = v + b;
+    }
+    b *= 2;
+  }
+  me.dest.setIntValue(v);
+}
+
+############################################################
+# Switch decoder: Decodes a bitmask in an int property.
+#   src     -                 : property node
+#   actions - list of actions : [func(b)]
+# Actions are triggered when their input bit change.
+# Due to interpolation the decoder needs to wait for a
+# stable input value.
+var SwitchDecoder = {};
+SwitchDecoder.new = func (src, actions) {
+  var obj = { parents : [SwitchDecoder],
+              wait         : 0,
+              old          : 0,
+              old_stable   : 0,
+              stable_since : 0,
+              reset        : 1,
+              src          : src,
+              actions      : actions,
+              MIN_STABLE   : 0.1 };
+  # Error checking.
+  var bad = (obj.src == nil);
+  foreach (var a; obj.actions) {
+    if (a == nil) { bad = 1; }
+  }
+  
+  if (bad) {
+    print("SwitchDecoder[");
+    print("  ", debug.string(obj.src));
+    foreach (var a; obj.actions) {
+      print("  ", debug.string(a));
+    }
+    print("]");
+    fail();
+  }
+
+  return obj;
+}
+SwitchDecoder.update = func () {
+  var t = getprop("/sim/time/elapsed-sec"); # NOTE: simulated time.
+  var v = me.src.getValue();
+  if (!is_num(v)) return;
+
+  if ((me.old == v) and ((t - me.stable_since) > me.MIN_STABLE) and
+      (me.wait == 1)) {
+    var ov = me.old_stable;
+# Use this to improve.
+#<cptf> here's the boring version:  var bittest = func(u, b) { while (b) { u = int(u / 2); b -= 1; } u != int(u / 2) * 2; }
+    forindex (var i; me.actions) {
+      var m  = math.mod(v, 2);
+      var om = math.mod(ov, 2);
+      if ((m != om or me.reset)) { me.actions[i](m?1:0); }
+      v  = (v - m)/2;
+      ov = (ov - om)/2;
+    }
+    me.old_stable = me.src.getValue();
+    me.wait  = 0;
+    me.reset = 0;
+  } elsif (me.old == v) {
+    # Wait. This is either before the bitmask is stable or after
+    # it has been processed. 
+  } else {
+    me.stable_since = t;
+    me.wait         = 1;
+    me.old          = me.src.getValue();
+  }
+}
+
+############################################################
+# Time division multiplexing encoder: Transmits a list of
+# properties over a MP enabled string property.
+#   inputs  - input properties : [property node]
+#   dest    - MP string prop   : property node
+# Note: TDM can have high latency so it is best used for
+# non-time critical properties.
+var TDMEncoder = {};
+TDMEncoder.new = func (inputs, dest) {
+  var obj = { parents   : [TDMEncoder],
+              inputs    : inputs,
+              channel   : MessageChannel.new(dest,
+                                             func (msg) {
+                                               print("This should not happen!");
+                                             }),
+              MIN_INT   : 0.25,
+              last_time : 0,
+              next_item : 0,
+              old       : [] };
+  # Error checking.
+  var bad = (dest == nil) or (obj.channel == nil);
+  foreach (var i; inputs) {
+    if (i == nil) { bad = 1; }
+  }
+
+  if (bad) {
+    print("TDMEncoder[");
+    foreach (var i; inputs) {
+      print("  ", debug.string(i));
+    }
+    print("  ", debug.string(dest));
+    print("]");
+  }
+
+  setsize(obj.old, size(obj.inputs));
+
+  return obj;
+}
+TDMEncoder.update = func () {
+  var t = getprop("/sim/time/elapsed-sec"); # NOTE: simulated time.
+  if (t > me.last_time + me.MIN_INT) {
+    var n = size(me.inputs);
+    while (1) {
+      var v = me.inputs[me.next_item].getValue();
+
+      if ((n <= 0) or (me.old[me.next_item] != v)) {
+        # Set the MP properties to send the next item.
+        me.channel.send(Binary.encodeByte(me.next_item) ~
+                        Binary.encodeDouble(v));
+
+        me.old[me.next_item] = v;
+
+        me.last_time = t;
+        me.next_item += 1;
+        if (me.next_item >= size(me.inputs)) { me.next_item = 0; }
+        return;
+      } else {
+        # Search for changed property.
+        n -= 1;
+        me.next_item += 1;
+        if (me.next_item >= size(me.inputs)) { me.next_item = 0; }
+      }         
+    }
+  }
+}
+
+############################################################
+# Time division multiplexing decoder: Receives a list of
+# properties over a MP enabled string property.
+#   src     - MP string prop  : property node
+#   actions - list of actions : [func(v)]
+# An action is triggered when its value is received.
+# Note: TDM can have high latency so it is best used for
+# non-time critical properties.
+var TDMDecoder = {};
+TDMDecoder.new = func (src, actions) {
+  var obj = { parents      : [TDMDecoder],
+              actions      : actions };
+  obj.channel = MessageChannel.new(src,
+                                   func (msg) {
+                                     obj.process(msg);
+                                   });
+
+  # Error checking.
+  var bad = (src == nil) or (obj.channel == nil);
+  foreach (var a; actions) {
+    if (a == nil) { bad = 1; }
+  }
+
+  if (bad) {
+    print("TDMDecoder[");
+    print("  ", debug.string(src));
+    foreach (var a; actions) {
+      print("  ", debug.string(a));
+    }
+    print("]");
+    fail();
+  }
+
+  return obj;
+}
+TDMDecoder.process = func (msg) {
+  var v1 = Binary.decodeByte(msg);
+  var v2 = Binary.decodeDouble(substr(msg, 1));
+  # Trigger action.
+  me.actions[v1](v2);
+}
+TDMDecoder.update = func {
+  me.channel.update();
+}
+
+###############################################################################
+# Internal utility functions
+
+var is_num = func (v) {
+    return num(v) != nil;
+}
+
+# fail causes a Nasal runtime error so we get a backtrace.
+var fail = func {
+    error_detected_in_calling_context();
+}
+
+###############################################################################
+
+###############################################################################
+# Copilot selection dialog.
+#
+# Usage: dual_control_tools.copilot_dialog.show(<copilot type string>);
+#
+var COPILOT_DLG = 0;
+var copilot_dialog = {};
+############################################################
+copilot_dialog.init = func (copilot_type, x = nil, y = nil) {
+    me.x = x;
+    me.y = y;
+    me.bg = [0, 0, 0, 0.3];    # background color
+    me.fg = [[1.0, 1.0, 1.0, 1.0]]; 
+    #
+    # "private"
+    if (contains(aircraft_dual_control, "copilot_view")) {
+        me.title = "Pilot selection";
+    } else {
+        me.title = "Copilot selection";
+    }
+    me.basenode = props.globals.getNode("sim/remote", 1);
+    me.dialog = nil;
+    me.namenode = props.Node.new({"dialog-name" : me.title });
+    me.listeners = [];
+    me.copilot_type = copilot_type;
+}
+############################################################
+copilot_dialog.create = func {
+    if (me.dialog != nil)
+        me.close();
+
+    me.dialog = gui.Widget.new();
+    me.dialog.set("name", me.title);
+    if (me.x != nil)
+        me.dialog.set("x", me.x);
+    if (me.y != nil)
+        me.dialog.set("y", me.y);
+
+    me.dialog.set("layout", "vbox");
+    me.dialog.set("default-padding", 0);
+    var titlebar = me.dialog.addChild("group");
+    titlebar.set("layout", "hbox");
+    titlebar.addChild("empty").set("stretch", 1);
+    if (contains(aircraft_dual_control, "copilot_view")) {
+        titlebar.addChild("text").set("label", "Book your flight");
+    } else {
+        titlebar.addChild("text").set("label", "Passengers online");
+    }
+    var w = titlebar.addChild("button");
+    w.set("pref-width", 16);
+    w.set("pref-height", 16);
+    w.set("legend", "");
+    w.set("default", 0);
+    w.set("key", "esc");
+    w.setBinding("nasal", "dual_control_tools.copilot_dialog.destroy(); ");
+    w.setBinding("dialog-close");
+    me.dialog.addChild("hrule");
+
+    var content = me.dialog.addChild("group");
+    content.set("layout", "vbox");
+    content.set("halign", "center");
+    content.set("default-padding", 5);
+
+    # Generate the dialog contents.
+    me.players = me.find_copilot_players();
+    var i = 0;
+    var tmpbase  = me.basenode.getNode("dialog", 1);
+    var selected = me.basenode.getNode("pilot-callsign").getValue();
+    foreach (var p; me.players) {
+        var tmp = tmpbase.getNode("b[" ~ i ~ "]", 1);
+        tmp.setBoolValue(streq(selected, p));
+        var w = content.addChild("checkbox");
+        w.node.setValues({"label"    : p,
+                          "halign"   : "left",
+                          "property" : tmp.getPath()});
+        w.setBinding
+            ("nasal",
+             "dual_control_tools.copilot_dialog.select_action(" ~ i ~ ");");
+        i = i + 1;
+    }
+    me.dialog.addChild("hrule");
+
+    # Display the dialog.
+    fgcommand("dialog-new", me.dialog.prop());
+    fgcommand("dialog-show", me.namenode);
+}
+############################################################
+copilot_dialog.close = func {
+    fgcommand("dialog-close", me.namenode);
+}
+############################################################
+copilot_dialog.destroy = func {
+    COPILOT_DLG = 0;
+    me.close();
+    foreach(var l; me.listeners)
+        removelistener(l);
+    delete(gui.dialog, "\"" ~ me.title ~ "\"");
+}
+############################################################
+copilot_dialog.show = func (copilot_type) {
+#    print("Showing MPCopilots dialog!");
+    if (!COPILOT_DLG) {
+        COPILOT_DLG = int(getprop("/sim/time/elapsed-sec"));
+        me.init(copilot_type);
+        me.create();
+        me._update_(COPILOT_DLG);
+    }
+}
+############################################################
+copilot_dialog._redraw_ = func {
+    if (me.dialog != nil) {
+        me.close();
+        me.create();
+    }
+}
+############################################################
+copilot_dialog._update_ = func (id) {
+    if (COPILOT_DLG != id) return;
+    me._redraw_();
+    settimer(func { me._update_(id); }, 4.1);
+}
+############################################################
+copilot_dialog.select_action = func (n) {
+    var selected = me.basenode.getNode("pilot-callsign").getValue();
+    var bs = me.basenode.getNode("dialog").getChildren();
+    # Assumption: There are two true b:s or none. The one not matching selected
+    #             is the new selection.
+    var i = 0;
+    me.basenode.getNode("pilot-callsign").setValue("");
+    foreach (var b; bs) {
+        if (!b.getValue() and (i == n)) {
+            b.setValue(1);
+            me.basenode.getNode("pilot-callsign").setValue(me.players[i]);
+        } else {
+            b.setValue(0);
+        }
+        i = i + 1;
+    }
+    dual_control.main.reset();
+    me._redraw_();
+}
+############################################################
+# Return a list containing all nearby copilot players of the right type.
+copilot_dialog.find_copilot_players = func {
+    var mpplayers =
+        props.globals.getNode("ai/models").getChildren("multiplayer");
+
+    var res = [];
+    foreach (var pilot; mpplayers) {
+        if ((pilot.getNode("valid") != nil) and
+            (pilot.getNode("valid").getValue()) and
+            (pilot.getNode("sim/model/path") != nil)) {
+            var type = pilot.getNode("sim/model/path").getValue();
+
+            if (type == me.copilot_type) {
+                append(res, pilot.getNode("callsign").getValue());
+            }
+        }
+    }
+#    debug.dump(res);
+    return res; 
+}
+###############################################################################
diff --git a/test/json.nas b/test/json.nas
new file mode 100644
index 0000000..8ed0a33
--- /dev/null
+++ b/test/json.nas
@@ -0,0 +1,195 @@
+#lib json.nas
+var json={
+    text:'',
+    line:1,
+    size:0,
+    ptr:0,
+    get:nil,
+    check:nil,
+    next:nil,
+    match:nil,
+    hash_gen:nil,
+    vec_gen:nil,
+    member:nil,
+    parse:nil,
+    token:{content:'',type:''},
+    content:[],
+};
+
+json.get=func(filename)
+{
+    me.line=1;
+    me.ptr=0;
+    me.content=[];
+    me.token={content:'',type:''};
+    me.text=io.fin(filename);
+    if(!size(me.text))
+        die("cannot open "~filename);
+    me.text=split('',me.text);
+    me.size=size(me.text);
+    return;
+}
+
+json.check=func(ptr)
+{
+    var str=me.text[ptr];
+    return (str=='{' or str=='}' or str=='[' or str==']' or str==',' or str==':' or str=='\"' or ('0'<=str and str<='9'));
+}
+
+json.next=func()
+{
+    while(me.ptr<me.size and !json.check(me.ptr))
+    {
+        if(me.text[me.ptr]=='\n')
+            me.line+=1;
+        me.ptr+=1;
+    }
+    if(me.ptr>=me.size)
+    {
+        me.token.content="";
+        me.token.type="eof";
+        return;
+    }
+    
+    if(me.text[me.ptr]=='{')
+    {
+        me.token.content='{';
+        me.token.type="left brace";
+    }
+    elsif(me.text[me.ptr]=='}')
+    {
+        me.token.content='}';
+        me.token.type="right brace";
+    }
+    elsif(me.text[me.ptr]=='[')
+    {
+        me.token.content='[';
+        me.token.type="left bracket";
+    }
+    elsif(me.text[me.ptr]==']')
+    {
+        me.token.content=']';
+        me.token.type="right bracket";
+    }
+    elsif(me.text[me.ptr]==',')
+    {
+        me.token.content=',';
+        me.token.type="comma";
+    }
+    elsif(me.text[me.ptr]==':')
+    {
+        me.token.content=':';
+        me.token.type="colon";
+    }
+    elsif(me.text[me.ptr]=='\"')
+    {
+        var s="";
+        me.ptr+=1;
+        while(me.ptr<me.size and me.text[me.ptr]!='\"')
+        {
+            s~=me.text[me.ptr];
+            me.ptr+=1;
+        }
+        me.token.content=s;
+        me.token.type="string";
+    }
+    elsif('0'<=me.text[me.ptr] and me.text[me.ptr]<='9')
+    {
+        var s=me.text[me.ptr];
+        me.ptr+=1;
+        while(me.ptr<me.size and (('0'<=me.text[me.ptr] and me.text[me.ptr]<='9') or me.text[me.ptr]=='.'))
+        {
+            s~=me.text[me.ptr];
+            me.ptr+=1;
+        }
+        me.ptr-=1;
+        me.token.content=num(s);
+        me.token.type="number";
+    }
+    me.ptr+=1;
+    return;
+}
+
+json.match=func(type)
+{
+    if(me.token.type!=type)
+        print("line ",me.line,": expect ",type," but get ",me.token.content,".");
+    me.next();
+    return;
+}
+
+json.hash_gen=func()
+{
+    var hash={};
+    me.match("left brace");
+    me.member(hash);
+    while(me.token.type=="comma")
+    {
+        me.match("comma");
+        me.member(hash);
+    }
+    me.match("right brace");
+    return hash;
+}
+
+json.vec_gen=func()
+{
+    var vec=[];
+    me.match("left bracket");
+    if(me.token.type=="left brace")
+        append(vec,me.hash_gen());
+    elsif(me.token.type=="left bracket")
+        append(vec,me.vec_gen());
+    elsif(me.token.type=="string" or me.token.type=="number")
+    {
+        append(vec,me.token.content);
+        me.next();
+    }
+    while(me.token.type=="comma")
+    {
+        me.match("comma");
+        if(me.token.type=="left brace")
+            append(vec,me.hash_gen());
+        elsif(me.token.type=="left bracket")
+            append(vec,me.vec_gen());
+        elsif(me.token.type=="string" or me.token.type=="number")
+        {
+            append(vec,me.token.content);
+            me.next();
+        }
+    }
+    me.match("right bracket");
+    return vec;
+}
+
+json.member=func(hash)
+{
+    var name=me.token.content;
+    me.match("string");
+    me.match("colon");
+    if(me.token.type=="left brace")
+        hash[name]=me.hash_gen();
+    elsif(me.token.type=="left bracket")
+        hash[name]=me.vec_gen();
+    elsif(me.token.type=="string" or me.token.type=="number")
+    {
+        hash[name]=me.token.content;
+        me.next();
+    }
+    return;
+}
+
+json.parse=func()
+{
+    me.content={};
+    me.next();
+    me.match("left brace");
+    me.member(me.content);
+    while(me.token.type=="comma")
+    {
+        me.match("comma");
+        me.member(me.content);
+    }
+    me.match("right brace");
+    return;
+}
\ No newline at end of file
diff --git a/test/lib.nas b/test/lib.nas
new file mode 100644
index 0000000..1ef83a7
--- /dev/null
+++ b/test/lib.nas
@@ -0,0 +1,167 @@
+var import=func(filename)
+{
+    nasal_call_import(filename);
+    return nil;
+}
+var print=func(elements...)
+{
+    nasal_call_builtin_std_cout(elements);
+    return nil;
+};
+var append=func(vector,elements...)
+{
+    nasal_call_builtin_push_back(vector,elements);
+    return nil;
+}
+var setsize=func(vector,size)
+{
+    nasal_call_builtin_set_size(vector,size);
+    return nil;
+}
+var system=func(str)
+{
+    nasal_call_builtin_system(str);
+    return;
+}
+var input=func()
+{
+    return nasal_call_builtin_input();
+}
+var sleep=func(duration)
+{
+    nasal_call_builtin_sleep(duration);
+    return;
+}
+var split=func(delimeter,string)
+{
+    return nasal_call_builtin_split(delimeter,string);
+}
+var rand=func(seed=nil)
+{
+    return nasal_call_builtin_rand(seed);
+}
+var id=func(thing)
+{
+    return nasal_call_builtin_get_id(thing);
+}
+var int=func(value)
+{
+    return nasal_call_builtin_trans_int(value);
+}
+var num=func(value)
+{
+    return nasal_call_builtin_trans_num(value);
+}
+var pop=func(vector)
+{
+    return nasal_call_builtin_pop_back(vector);
+}
+var str=func(number)
+{
+    return nasal_call_builtin_trans_str(number);
+}
+var size=func(object)
+{
+    return nasal_call_builtin_size(object);
+}
+var contains=func(hash,key)
+{
+    return nasal_call_builtin_contains(hash,key);
+}
+var delete=func(hash,key)
+{
+    nasal_call_builtin_delete(hash,key);
+    return;
+}
+var keys=func(hash)
+{
+    return nasal_call_builtin_get_keys(hash);
+}
+var time=func(begin_time)
+{
+    return nasal_call_builtin_time(begin_time);
+}
+var die=func(str)
+{
+    nasal_call_builtin_die(str);
+    return nil;
+}
+var typeof=func(object)
+{
+    return nasal_call_builtin_type(object);
+}
+var substr=func(str,begin,length)
+{
+    return nasal_call_builtin_substr(str,begin,length);
+}
+
+var io=
+{
+    fin:func(filename)
+    {
+        return nasal_call_builtin_finput(filename);
+    },
+    fout:func(filename,str)
+    {
+        nasal_call_builtin_foutput(filename,str);
+        return;
+    }
+};
+
+var bits=
+{
+    bitxor:func(a,b)
+    {
+        return nasal_call_builtin_xor(a,b);
+    },
+    bitand:func(a,b)
+    {
+        return nasal_call_builtin_and(a,b);
+    },
+    bitor:func(a,b)
+    {
+        return nasal_call_builtin_or(a,b);
+    },
+    bitnand:func(a,b)
+    {
+        return nasal_call_builtin_nand(a,b);
+    },
+    bitnot:func(a)
+    {
+        return nasal_call_builtin_not(a);
+    }
+};
+
+var math=
+{
+    e:2.7182818284590452354,
+    pi:3.14159265358979323846,
+    sin:func(x)
+    {
+        return nasal_call_builtin_sin(x);
+    },
+    cos:func(x)
+    {
+        return nasal_call_builtin_cos(x);
+    },
+    tan:func(x)
+    {
+        return nasal_call_builtin_tan(x);
+    },
+    exp:func(x)
+    {
+        return nasal_call_builtin_exp(x);
+    }, 
+    ln:func(x)
+    {
+        return nasal_call_builtin_cpp_math_ln(x);
+    },
+    sqrt:func(x)
+    {
+        return nasal_call_builtin_cpp_math_sqrt(x);
+    },
+    atan2:func(x,y)
+    {
+        return nasal_call_builtin_cpp_atan2(x,y);
+    },
+};
diff --git a/test/loop.nas b/test/loop.nas
index 0109613..e01d21e 100644
--- a/test/loop.nas
+++ b/test/loop.nas
@@ -1,38 +1,30 @@
-while(n==1 )
+for(;;)break;
+for(;;)
 {
-    i=i+1;
-    f(i);
-    print("str");
+    var a=1;
+    break;
+}
+for(var i=1;;)break;
+for(var i=1;;i+=1)break;
+for(var i=1;i<10;i+=1)print(i);
+
+while(1)break;
+var j=0;
+while(j<10)
+{
+    print(j);
+    j+=1;
 }
 
-while(n==1 and "str"==str)
+forindex(var j;[0,1,2,3])print(j);
+forindex(var j;[0,1,2,3])
 {
-    print("str");
+    var a=j;
+    print(a*a);
 }
-
-i+=i1;
-i+=i.i[0];
-i=i.i[0].i(0);
-var hash={
-    f:func {var e=1;return 0;},
-};
-for(var i=0;i<1024;i+=1)
+foreach(var j;[0,1,2,3])print([0,1,2,3][j]);
+foreach(var j;[0,1,2,3])
 {
-    print(i);
+    var a=[0,1,2,3][j];
+    print(a*a-1);
 }
-for(var i=0;(2*512)>=i;i+=1)
-{
-    print(i);
-}
-foreach(var i;[1+(1+1),2,3,4])
-{
-    print(i);
-}
-forindex(var i=list;[1,2,3,4])
-{
-    print(i[0]);
-}
-while(!id)
-{
-    print("yes");
-}
\ No newline at end of file
diff --git a/test/main.nas b/test/main.nas
new file mode 100644
index 0000000..cab6aed
--- /dev/null
+++ b/test/main.nas
@@ -0,0 +1,382 @@
+# game left in corner by ValKmjolnir
+# 2020
+
+# lib function defined here
+var print=func(elements...)
+{
+    nasal_call_builtin_std_cout(elements);
+    return nil;
+};
+var append=func(vector,elements...)
+{
+    nasal_call_builtin_push_back(vector,elements);
+    return nil;
+}
+var setsize=func(vector,size)
+{
+    nasal_call_builtin_set_size(vector,size);
+    return nil;
+}
+var system=func(str)
+{
+    nasal_call_builtin_system(str);
+    return;
+}
+var sleep=func(duration)
+{
+    nasal_call_builtin_sleep(duration);
+    return;
+}
+var input=func()
+{
+    return nasal_call_builtin_input();
+}
+var io=
+{
+    fin:func(filename)
+    {
+        return nasal_call_builtin_finput(filename);
+    },
+    fout:func(filename,str)
+    {
+        nasal_call_builtin_foutput(filename,str);
+        return;
+    }
+};
+var int=func(str)
+{
+    return str+0;
+}
+var str=func(num)
+{
+    return num~'';
+}
+# string split
+
+# game elements defined here
+var role_property=
+{
+    health:100,
+    mood:100,
+    satiety:100,
+    thirst:100,
+    health_change:func(x)
+    {
+        me.health+=x;
+        if(me.health<0)
+            me.health=0;
+        elsif(me.health>100)
+            me.health=100;
+        return nil;
+    },
+    mood_change:func(x)
+    {
+        me.mood+=x;
+        if(me.mood<0)
+            me.mood=0;
+        elsif(me.mood>100)
+            me.mood=100;
+        return nil;
+    },
+    satiety_change:func(x)
+    {
+        me.satiety+=x;
+        if(me.satiety<0)
+            me.satiety=0;
+        elsif(me.satiety>100)
+            me.satiety=100;
+        return nil;
+    },
+    thirst_change:func(x)
+    {
+        me.thirst+=x;
+        if(me.thirst<0)
+            me.thirst=0;
+        elsif(me.thirst>100)
+            me.thirst=100;
+        return nil;
+    }
+};
+var screen=
+{
+    picture:[],
+    info_below_left:[],
+    info_below_right:[],
+    clear:func()
+    {
+        me.picture=[];
+        me.info_below_left=[];
+        me.info_below_right=[];
+        return;
+    },
+    pic_addline:func(_str)
+    {
+        append(me.picture,_str);
+        return;
+    },
+    left_add:func(_str)
+    {
+        append(me.info_below_left,_str);
+        return;
+    },
+    right_add:func(_str)
+    {
+        append(me.info_below_right,_str);
+        return;
+    },
+    prt_screen:func()
+    {
+        foreach(var i;me.picture)
+            print(i);
+        forindex(var i;me.info_below_left)
+            print(me.info_below_left[i]~me.info_below_right[i]);
+        return;
+    }
+};
+var first_shown_info=func()
+{
+    system("cls");
+    var str_list=[
+        "+-----------------------------------------------+",
+        "|                                               |",
+        "|                                               |",
+        "| Let me tell you a story...                    |",
+        "| A story that really happened many years ago...|",
+        "| Nearly no one knows and cares about it...     |",
+        "| But some children may still suffer from...    |",
+        "| This kind of stories...                       |",
+        "| And this kind of stories never stop hurting...|",
+        "| People that are still alive...                |",
+        "|                                               |",
+        "|                                               |",
+        "+-----------------------------------------------+"
+    ];
+    foreach(var i;str_list)
+        print(i);
+    return;
+}
+var generate_role_property=func()
+{
+    screen.left_add("+-----------------------+");
+    var str="";
+    for(var i=10;i<=100;i+=10)
+    {
+        if(i<=role_property.health)
+            str~="=";
+        else
+            str~=" ";
+    }
+    screen.left_add("|[health ]:"~str~"   |");
+    str="";
+    for(var i=10;i<=100;i+=10)
+    {
+        if(i<=role_property.mood)
+            str~="=";
+        else
+            str~=" ";
+    }
+    screen.left_add("|[mood   ]:"~str~"   |");
+    str="";
+    for(var i=10;i<=100;i+=10)
+    {
+        if(i<=role_property.satiety)
+            str~="=";
+        else
+            str~=" ";
+    }
+    screen.left_add("|[satiety]:"~str~"   |");
+    str="";
+    for(var i=10;i<=100;i+=10)
+    {
+        if(i<=role_property.thirst)
+            str~="=";
+        else
+            str~=" ";
+    }
+    screen.left_add("|[thirst ]:"~str~"   |");
+    screen.left_add("+-----------------------+");
+    return;
+}
+var generate_choose_list=func()
+{
+    var str_list=[
+        "-----------------------+",
+        "[1]| next step         |",
+        "[2]| restart           |",
+        "[3]| store game        |",
+        "[4]| exit              |",
+        "-----------------------+"
+    ];
+    foreach(var i;str_list)
+        screen.right_add(i);
+    return;
+}
+var next_step=func()
+{
+    role_property.health_change(-1);
+    role_property.mood_change(-1);
+    role_property.satiety_change(-1);
+    role_property.thirst_change(-10);
+    var str_list=[
+        "+-----------------------------------------------+",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "+-----------------------------------------------+"
+    ];
+    foreach(var i;str_list)
+        screen.pic_addline(i);
+    return;
+}
+var restart=func()
+{
+    role_property.health=100;
+    role_property.mood=100;
+    role_property.satiety=100;
+    role_property.thirst=100;
+    var str_list=[
+        "+-----------------------------------------------+",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "+-----------------------------------------------+"
+    ];
+    foreach(var i;str_list)
+        screen.pic_addline(i);
+    return;
+}
+var generate_incorrect_choice_screen=func()
+{
+    var str_list=[
+        "+-----------------------------------------------+",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|            make a correct choice.             |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "+-----------------------------------------------+"
+    ];
+    foreach(var i;str_list)
+        screen.pic_addline(i);
+}
+var generate_goodbye_screen=func()
+{
+    var str_list=[
+        "+-----------------------------------------------+",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|              see you next life.               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "+-----------------------------------------------+"
+    ];
+    foreach(var i;str_list)
+        screen.pic_addline(i);
+}
+var store_file=func()
+{
+    var str=role_property.health~'\n'~role_property.mood~'\n'~role_property.satiety~'\n'~role_property.thirst~'\n';
+    io.fout("game-left-in-corner.glic",str);
+    var str_list=[
+        "+-----------------------------------------------+",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                  data stored.                 |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "|                                               |",
+        "+-----------------------------------------------+"
+    ];
+    foreach(var i;str_list)
+        screen.pic_addline(i);
+    return;
+}
+var get_file=func()
+{
+    var str=io.fin("game-left-in-corner.glic");
+    print(str);
+    return;
+}
+var game_main=func()
+{
+    first_shown_info();
+    screen.clear();
+    generate_role_property();
+    generate_choose_list();
+    screen.prt_screen();
+    while(1)
+    {
+        screen.clear();
+        print("|your choice[1|2|3|4]:                          |");
+        var choice=input();
+        if((choice!='1') and (choice!='2') and (choice!='3') and (choice!='4'))
+            generate_incorrect_choice_screen();
+        elsif(choice=='1')
+            next_step();
+        elsif(choice=='2')
+            restart();
+        elsif(choice=='3')
+            store_file();
+        elsif(choice=='4')
+        {
+            system("cls");
+            screen.clear();
+            generate_goodbye_screen();
+            generate_role_property();
+            generate_choose_list();
+            screen.prt_screen();
+            break;
+        }
+        system("cls");
+        generate_role_property();
+        generate_choose_list();
+        screen.prt_screen();
+        if(role_property.health==0 or role_property.mood==0 or role_property.satiety==0 or role_property.thirst==0)
+        {
+            print("|you died.                                      |");
+            print("+-----------------------------------------------+");
+            system("pause");
+            screen.clear();
+            restart();
+            system("cls");
+            generate_role_property();
+            generate_choose_list();
+            screen.prt_screen();
+        }
+    }
+    return;
+}
+game_main();
\ No newline at end of file
diff --git a/test/neo4j.nas b/test/neo4j.nas
new file mode 100644
index 0000000..e961253
--- /dev/null
+++ b/test/neo4j.nas
@@ -0,0 +1,156 @@
+import("lib.nas");
+
+rand(time(0));
+var chartable=split('','abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789');
+var node=func(type)
+{
+    var s="";
+    for(var i=0;i<10;i+=1)
+        s~=chartable[rand()*62];
+    return {name:s,type:type,next:[]};
+}
+var film_node=[];
+for(var i=0;i<1000;i+=1)
+    append(film_node,node("film"));
+var director_node=[];
+for(var i=0;i<400;i+=1)
+    append(director_node,node("direct"));
+var actor_node=[];
+for(var i=0;i<2000;i+=1)
+    append(actor_node,node("actor"));
+var writer_node=[];
+for(var i=0;i<300;i+=1)
+    append(writer_node,node("writer"));
+var type_node=[];
+for(var i=0;i<20;i+=1)
+    append(type_node,node("type"));
+var lang_node=[];
+for(var i=0;i<120;i+=1)
+    append(lang_node,node("lang"));
+var country_node=[];
+for(var i=0;i<120;i+=1)
+    append(country_node,node("country"));
+
+func()
+{
+    var director_size=size(director_node);
+    var actor_size=size(actor_node);
+    var writer_size=size(writer_node);
+    var type_size=size(type_node);
+    var lang_size=size(lang_node);
+    var country_size=size(country_node);
+
+    var director_link=int(1+rand()*2);
+    var actor_link=int(1+rand()*10);
+    var writer_link=int(1+rand());
+    var type_link=int(1+rand()*3);
+    var lang_link=int(1+rand()*4);
+    var country_link=int(1+rand()*2);
+    foreach(var film;film_node)
+    {
+        for(var i=0;i<director_link;i+=1)
+        {
+            var director=director_node[rand()*director_size];
+            append(film.next,director);
+            append(director.next,film);
+        }
+        for(var i=0;i<actor_link;i+=1)
+        {
+            var actor=actor_node[rand()*actor_size];
+            append(film.next,actor);
+            append(actor.next,film);
+        }
+        for(var i=0;i<writer_link;i+=1)
+        {
+            var writer=writer_node[rand()*writer_size];
+            append(film.next,writer);
+            append(writer.next,film);
+        }
+        for(var i=0;i<type_link;i+=1)
+        {
+            var _type=type_node[rand()*type_size];
+            append(film.next,_type);
+            append(_type.next,film);
+        }
+        for(var i=0;i<lang_link;i+=1)
+        {
+            var lang=lang_node[rand()*lang_size];
+            append(film.next,lang);
+            append(lang.next,film);
+        }
+        for(var i=0;i<country_link;i+=1)
+        {
+            var country=country_node[rand()*country_size];
+            append(film.next,country);
+            append(country.next,film);
+        }
+    }
+    return;
+}();
+
+
+var film_list=[];
+var count_list=[];
+for(var i=0;i<10;i+=1)
+{
+    append(film_list,film_node[i]);
+    append(count_list,1);
+}
+
+var sort_list=func(begin,end)
+{
+    for(var i=begin;i<end;i+=1)
+    {
+        var index=i;
+        for(var j=i+1;j<end;j+=1)
+            if(count_list[index]<count_list[j])
+                index=j;
+        if(index!=i)
+        {
+            var tmp=film_list[i];
+            film_list[i]=film_list[index];
+            film_list[index]=tmp;
+            tmp=count_list[i];
+            count_list[i]=count_list[index];
+            count_list[index]=tmp;
+        }
+    }
+    return;
+}
+
+while(1)
+{
+    var list_size=size(film_list);
+    list_size=list_size>10?10:list_size;
+    for(var i=0;i<list_size;i+=1)
+        print(i,'\t:',film_list[i].name,'\t',count_list[i]);
+    var choose=input();
+    if(choose=="exit")
+        break;
+    if(num(choose)>=list_size)
+        die("choose a correct index");
+    var label_list=film_node[num(choose)].next;
+    film_list=[];
+    count_list=[];
+    foreach(var label;label_list)
+        foreach(var film;label.next)
+        {
+            var has=0;
+            for(var i=0;i<size(film_list);i+=1)
+                if(film_list[i].name==film.name)
+                {
+                    has=1;
+                    count_list[i]+=rand();
+                    break;
+                }
+            if(has==0)
+            {
+                append(film_list,film);
+                append(count_list,1);
+            }
+        }
+    sort_list(0,size(film_list));
+}
+
+foreach(var film;film_node)
+    setsize(film.next,0);
diff --git a/test/prop.nas b/test/prop.nas
new file mode 100644
index 0000000..d4536b7
--- /dev/null
+++ b/test/prop.nas
@@ -0,0 +1,246 @@
+import("lib.nas");
+
+var property_tree=
+{
+    accelerations:
+    {
+        'n-z-cg-fps_sec':0,
+        ned:
+        {
+            'down-accel-fps_sec':0,
+            'east-accel-fps_sec':0,
+            'north-accel-fps_sec':0,
+        },
+        nlf:0,
+        pilot:
+        {
+            'x-accel-fps_sec':0,
+            'y-accel-fps_sec':0,
+            'z-accel-fps_sec':0,
+        },
+        'pilot-g':1,
+        'pilot-gdamped':1
+    },
+    ai:
+    {
+        models:
+        {
+            carrier:
+            {
+                callsign:'',
+                controls:{},
+                environment:{},
+                id:2,
+                name:'Nimitz',
+                navaids:{},
+                orientation:{},
+                position:{},
+                radar:{},
+                sign:'CVN-68',
+                sim:{},
+                subID:0,
+                submodels:
+                {
+                    path:'',
+                    serviceable:1
+                },
+                'surface-positions':{},
+                type:'AI',
+                valid:1,
+                velocities:{},
+                waypoint:{}
+            },
+            'carrier[1]':
+            {
+                callsign:'',
+                controls:{},
+                environment:{},
+                id:3,
+                name:'Eisenhower',
+                navaids:{},
+                orientation:{},
+                position:{},
+                radar:{},
+                sign:'CVN-69',
+                sim:{},
+                subID:0,
+                submodels:
+                {
+                    path:'',
+                    serviceable:0
+                },
+                'surface-positions':{},
+                type:'AI',
+                valid:1,
+                velocities:{},
+                waypoint:{}
+            },
+            count:2,
+            'model-added':'/ai[0]/models[0]/carrier[1]',
+            'model-removed':nil,
+            'num-players':0
+        },
+        submodels:
+        {
+            contrails:0
+        },
+    },
+    aircraft:
+    {
+        icao:
+        {
+            equipment:'SDFGY',
+            surveillance:'S',
+            type:'ZZZZ',
+            'wake-turbulence-category':'L'
+        },
+        performance:
+        {
+            approach:
+            {
+                'airspeed-knots':150,
+            },
+            climb:'\n\t\t\t\n\t\t\t',
+            cruise:
+            {
+                'airspeed-knots':1000,
+                'altitude-ft':4500,
+            },
+            descent:'\n\t\t\t\n\t\t\t',
+            maximum:'\n\t\t\t\n\t\t\t',
+            minimum:'\n\t\t\t\n\t\t\t',
+        },
+        settings:
+        {
+            fuel_persistent:0,
+            ground_services_persistent:0,
+            radio_persistent:0,
+            tooltips:1,
+            weight_persistent:0
+        }
+    },
+    autopilot:
+    {
+        internal:{},
+        locks:{},
+        'route-manager':{},
+        settings:{},
+        'target-tracking':{},
+    },
+    canvas:
+    {
+        'by-index':
+        {
+            texture:
+            {
+                background:'rgba(0,0,0,0)',
+                group:{},
+                name:'Tooltip',
+                placement:{},
+                size:600,
+                'size[1]':200,
+                status:0,
+                'status-msg':'OK',
+                view:300,
+                'view[1]':100
+            },
+            'texture[1]':
+            {
+                background:'rgba(0,0,0,0)',
+                group:{},
+                mipmapping:1,
+                name:'SymbolCache1024x1024',
+                placement:{},
+                size:1024,
+                'size[1]':1024,
+                status:0,
+                'status-msg':'OK',
+                view:1024,
+                'view[1]':1024
+            },
+            'texture[2]':
+            {
+                background:'rgba(0,0,0,0)',
+                group:{},
+                mipmapping:1,
+                name:'SymbolCache1024x1024',
+                placement:{},
+                size:1024,
+                'size[1]':1024,
+                status:0,
+                'status-msg':'OK',
+                view:1024,
+                'view[1]':1024
+            },
+        }
+    },
+    command:{},
+    consumables:{},
+    controls:{},
+    cursor:'Aircraft/ufo/Models/cursor.ac',
+    devices:{},
+    earthview:{},
+    engines:{},
+    environment:{},
+    ephemeris:{},
+    fdm:{},
+    gear:{},
+    hazards:{},
+    input:{},
+    instrumentation:{},
+    'local-weather':{},
+    logging:{},
+    models:{},
+    nasal:{},
+    orientation:{},
+    position:{},
+    rendering:{},
+    scenery:{},
+    sim:{},
+    source:'Models',
+    'surface-positions':{},
+    systems:{},
+    velocities:{},
+};
+
+var setprop=func(prop,value)
+{
+    if(type(prop)!="string")
+        die("setprop: prop is not a string");
+    var path=split('/',prop);
+    var tmp=property_tree;
+    var path_size=size(path);
+    for(var i=0;i<path_size-1;i+=1)
+        tmp=tmp[path[i]];
+    tmp[path[path_size-1]]=value;
+    return;
+}
+var getprop=func(prop)
+{
+    if(type(prop)!="string")
+        die("getprop: prop is not a string");
+    var path=split('/',prop);
+    var tmp=property_tree;
+    foreach(var i;path)
+        tmp=tmp[i];
+    return tmp;
+}
+setprop("aircraft/icao/type",'IDG MD-11');
+
+var print_prop=func(depth,prop)
+{
+    var s='';
+    for(var i=0;i<depth;i+=1)
+        s~='|  ';
+    if(type(prop)!="hash")
+        return;
+    var m=keys(prop);
+    foreach(var elem;m)
+    {
+        print(s,elem,':',prop[elem]);
+        print_prop(depth+1,prop[elem]);
+    }
+    return;
+}
+
+print_prop(0,property_tree);
\ No newline at end of file
diff --git a/test/props.nas b/test/props.nas
new file mode 100644
index 0000000..061f028
--- /dev/null
+++ b/test/props.nas
@@ -0,0 +1,576 @@
+##
+# Node class definition.  The class methods simply wrap the
+# low level extension functions which work on a "ghost" handle to a
+# SGPropertyNode object stored in the _g field.
+#
+# Not all of the features of SGPropertyNode are supported.  There is
+# no support for ties, obviously, as that wouldn't make much sense
+# from a Nasal context.  The various get/set methods work only on the
+# local node, there is no equivalent of the "relative path" variants
+# available in C++; just use node.getNode(path).whatever() instead.
+#
+var Node = {
+    getNode          : func wrap(_getNode(me._g, arg)),
+    getParent        : func wrap(_getParent(me._g, arg)),
+    getChild         : func wrap(_getChild(me._g, arg)),
+    getChildren      : func wrap(_getChildren(me._g, arg)),
+    setChildren      : func wrap(_setChildren(me._g, arg)),
+    addChild         : func wrap(_addChild(me._g, arg)),
+    addChildren      : func wrap(_addChildren(me._g, arg)),
+    removeChild      : func wrap(_removeChild(me._g, arg)),
+    removeChildren   : func wrap(_removeChildren(me._g, arg)),
+    removeAllChildren: func wrap(_removeAllChildren(me._g, arg)),
+    getAliasTarget   : func wrap(_getAliasTarget(me._g, arg)),
+
+    getName        : func _getName(me._g, arg),
+    getIndex       : func _getIndex(me._g, arg),
+    getType        : func _getType(me._g, arg),
+    getAttribute   : func _getAttribute(me._g, arg),
+    setAttribute   : func _setAttribute(me._g, arg),
+    getValue       : func _getValue(me._g, arg),
+    setValue       : func _setValue(me._g, arg),
+    setValues      : func _setValues(me._g, arg),
+    setIntValue    : func _setIntValue(me._g, arg),
+    setBoolValue   : func _setBoolValue(me._g, arg),
+    setDoubleValue : func _setDoubleValue(me._g, arg),
+    unalias        : func _unalias(me._g, arg),
+    alias          : func(n) _alias(me._g, [isa(n, Node) ? n._g : n]),
+    equals         : func(n) _equals(me._g, [isa(n, Node) ? n._g : n]),
+    clearValue     : func _alias(me._g, [_globals()]) and me.unalias(),
+
+    getPath : func {
+        var (name, index, parent) = (me.getName(), me.getIndex(), me.getParent());
+        if(index != 0)    { name ~= "[" ~ index ~ "]"; }
+        if(parent != nil) { name = parent.getPath() ~ "/" ~ name; }
+        return name;
+    },
+
+    getBoolValue : func {
+        var val = me.getValue();
+        var mytype = me.getType();
+        if((mytype == "STRING" or mytype == "UNSPECIFIED") and val == "false") return 0;
+        return !!val;
+    },
+
+    remove : func {
+        if((var p = me.getParent()) == nil) return nil;
+        p.removeChild(me.getName(), me.getIndex());
+    },
+};
+
+##
+# Static constructor for a Node object.  Accepts a Nasal hash
+# expression to initialize the object a-la setValues().
+#
+Node.new = func(values = nil) {
+    var result = wrapNode(_new());
+    if(typeof(values) == "hash")
+        result.setValues(values);
+    return result;
+}
+
+##
+# Counter piece of setValues(). Returns a hash with all values
+# in the subtree. Nodes with same name are returned as vector,
+# where the original node indices are lost. The function should
+# only be used if all or almost all values are needed, and never
+# in performance-critical code paths. If it's called on a node
+# without children, then the result is equivalent to getValue().
+#
+Node.getValues = func {
+    var children = me.getChildren();
+    if(!size(children)) return me.getValue();
+    var val = {};
+    var numchld = {};
+    foreach(var c; children) {
+        var name = c.getName();
+        if(contains(numchld, name)) { var nc = numchld[name]; }
+        else {
+            var nc = size(me.getChildren(name));
+            numchld[name] = nc;
+            if(nc > 1 and !contains(val, name)) val[name] = [];
+        }
+        if(nc > 1) append(val[name], c.getValues());
+        else val[name] = c.getValues();
+    }
+    return val;
+}
+
+##
+# Initializes property if it's still undefined.  First argument
+# is a property name/path. It can also be nil or an empty string,
+# in which case the node itself gets initialized, rather than one
+# of its children.  Second argument is the default value. The third,
+# optional argument is a property type (one of "STRING", "DOUBLE",
+# "INT", or "BOOL").  If it is omitted, then "DOUBLE" is used for
+# numbers, and STRING for everything else.  Returns the property
+# as props.Node.  The fourth optional argument enforces a type if
+# non-zero.
+#
+Node.initNode = func(path = nil, value = 0, type = nil, force = 0) {
+    var prop = me.getNode(path or "", 1);
+    if(prop.getType() != "NONE") value = prop.getValue();
+    if(force) prop.clearValue();
+    if(type == nil) prop.setValue(value);
+    elsif(type == "DOUBLE") prop.setDoubleValue(value);
+    elsif(type == "INT") prop.setIntValue(value);
+    elsif(type == "BOOL") prop.setBoolValue(value);
+    elsif(type == "STRING") prop.setValue("" ~ value);
+    else die("initNode(): unsupported type '" ~ type ~ "'");
+    return prop;
+}
+
+##
+# Useful debugging utility.  Recursively dumps the full state of a
+# Node object to the console.  Try binding "props.dump(props.globals)"
+# to a key for a fun hack.
+#
+var dump = func {
+    if(size(arg) == 1) { prefix = "";     node = arg[0]; }
+    else               { prefix = arg[0]; node = arg[1]; }
+
+    index = node.getIndex();
+    type = node.getType();
+    name = node.getName();
+    val = node.getValue();
+
+    if(val == nil) { val = "nil"; }
+    name = prefix ~ name;
+    if(index > 0) { name = name ~ "[" ~ index ~ "]"; }
+    print(name, " {", type, "} = ", val);
+
+    # Don't recurse into aliases, lest we get stuck in a loop
+    if(type != "ALIAS") {
+        children = node.getChildren();
+        foreach(c; children) { dump(name ~ "/", c); }
+    }
+}
+
+##
+# Recursively copy property branch from source Node to
+# destination Node. Doesn't copy aliases. Copies attributes
+# if optional third argument is set and non-zero.
+#
+var copy = func(src, dest, attr = 0) {
+    foreach(var c; src.getChildren()) {
+        var name = c.getName() ~ "[" ~ c.getIndex() ~ "]";
+        copy(src.getNode(name), dest.getNode(name, 1), attr);
+    }
+    var type = src.getType();
+    var val = src.getValue();
+    if(type == "ALIAS" or type == "NONE") return;
+    elsif(type == "BOOL") dest.setBoolValue(val);
+    elsif(type == "INT" or type == "LONG") dest.setIntValue(val);
+    elsif(type == "FLOAT" or type == "DOUBLE") dest.setDoubleValue(val);
+    else dest.setValue(val);
+    if(attr) dest.setAttribute(src.getAttribute());
+}
+
+##
+# Utility.  Turns any ghosts it finds (either solo, or in an
+# array) into Node objects.
+#
+var wrap = func(node) {
+    var argtype = typeof(node);
+    if(argtype == "ghost") {
+        return wrapNode(node);
+    } elsif(argtype == "vector") {
+        var v = node;
+        var n = size(v);
+        for(var i=0; i<n; i+=1) { v[i] = wrapNode(v[i]); }
+        return v;
+    }
+    return node;
+}
+
+##
+# Utility.  Returns a new object with its superclass/parent set to the
+# Node object and its _g (ghost) field set to the specified object.
+# Nasal's literal syntax can be pleasingly terse. I like that. :)
+#
+var wrapNode = func(node) { { parents : [Node], _g : node } }
+
+##
+# Global property tree.  Set once at initialization.  Is that OK?
+# Does anything ever call globals.set_props() from C++?  May need to
+# turn this into a function if so.
+#
+var globals = wrapNode(_globals());
+
+##
+# Shortcut for props.globals.getNode().
+#
+var getNode = func return call(props.globals.getNode, arg, props.globals);
+
+##
+# Sets all indexed property children to a single value.  arg[0]
+# specifies a property name (e.g. /controls/engines/engine), arg[1] a
+# path under each node of that name to set (e.g. "throttle"), arg[2]
+# is the value.
+#
+var setAll = func(base, child, value) {
+    var node = props.globals.getNode(base);
+    if(node == nil) return;
+    var name = node.getName();
+    node = node.getParent();
+    if(node == nil) return;
+    var children = node.getChildren();
+    foreach(var c; children)
+        if(c.getName() == name)
+            c.getNode(child, 1).setValue(value);
+}
+
+##
+# Turns about anything into a list of props.Nodes, including ghosts,
+# path strings, vectors or hashes containing, as well as functions
+# returning any of the former and in arbitrary nesting. This is meant
+# to be used in functions whose main purpose is to handle collections
+# of properties.
+#
+var nodeList = func {
+    var list = [];
+    foreach(var a; arg) {
+        var t = typeof(a);
+        if(isa(a, Node))
+            append(list, a);
+        elsif(t == "scalar")
+            append(list, props.globals.getNode(a, 1));
+        elsif(t == "vector")
+            foreach(var i; a)
+                list ~= nodeList(i);
+        elsif(t == "hash")
+            foreach(var i; keys(a))
+                list ~= nodeList(a[i]);
+        elsif(t == "func")
+            list ~= nodeList(a());
+        elsif(t == "ghost" and ghosttype(a) == "prop")
+            append(list, wrapNode(a));
+        else
+            die("nodeList: invalid nil property");
+    }
+    return list;
+}
+
+##
+# Compiles a <condition> property branch according to the rules
+# set out in $FG_ROOT/Docs/README.conditions into a Condition object.
+# The 'test' method of the returend object can be used to evaluate
+# the condition.
+# The function returns nil on error.
+#
+var compileCondition = func(p) {
+    if(p == nil) return nil;
+    if(!isa(p, Node)) p = props.globals.getNode(p);
+    return _createCondition(p._g);
+}
+
+##
+# Evaluates a <condition> property branch according to the rules
+# set out in $FG_ROOT/Docs/README.conditions. Undefined conditions
+# and a nil argument are "true". The function dumps the condition
+# branch and returns nil on error.
+#
+var condition = func(p) {
+    if(p == nil) return 1;
+    if(!isa(p, Node)) p = props.globals.getNode(p);
+    return _cond_and(p)
+}
+
+var _cond_and = func(p) {
+    foreach(var c; p.getChildren())
+        if(!_cond(c)) return 0;
+    return 1;
+}
+
+var _cond_or = func(p) {
+    foreach(var c; p.getChildren())
+        if(_cond(c)) return 1;
+    return 0;
+}
+
+var _cond = func(p) {
+    var n = p.getName();
+    if(n == "or") return _cond_or(p);
+    if(n == "and") return _cond_and(p);
+    if(n == "not") return !_cond_and(p);
+    if(n == "equals") return _cond_cmp(p, 0);
+    if(n == "not-equals") return !_cond_cmp(p, 0);
+    if(n == "less-than") return _cond_cmp(p, -1);
+    if(n == "greater-than") return _cond_cmp(p, 1);
+    if(n == "less-than-equals") return !_cond_cmp(p, 1);
+    if(n == "greater-than-equals") return !_cond_cmp(p, -1);
+    if(n == "property") return !!getprop(p.getValue());
+    printlog("alert", "condition: invalid operator ", n);
+    dump(p);
+    return nil;
+}
+
+var _cond_cmp = func(p, op) {
+    var left = p.getChild("property", 0, 0);
+    if(left != nil) { left = getprop(left.getValue()); }
+    else {
+        printlog("alert", "condition: no left value");
+        dump(p);
+        return nil;
+    }
+    var right = p.getChild("property", 1, 0);
+    if(right != nil) { right = getprop(right.getValue()); }
+    else {
+        right = p.getChild("value", 0, 0);
+        if(right != nil) { right = right.getValue(); }
+        else {
+            printlog("alert", "condition: no right value");
+            dump(p);
+            return nil;
+        }
+    }
+    if(left == nil or right == nil) {
+        printlog("alert", "condition: comparing with nil");
+        dump(p);
+        return nil;
+    }
+    if(op < 0) return left < right;
+    if(op > 0) return left > right;
+    return left == right;
+}
+
+##
+# Runs <binding> as described in $FG_ROOT/Docs/README.commands using
+# a given module by default, and returns 1 if fgcommand() succeeded,
+# or 0 otherwise. The module name won't override a <module> defined
+# in the binding.
+#
+var runBinding = func(node, module = nil) {
+    if(module != nil and node.getNode("module") == nil)
+        node.getNode("module", 1).setValue(module);
+    var cmd = node.getNode("command", 1).getValue() or "null";
+    condition(node.getNode("condition")) ? fgcommand(cmd, node) : 0;
+}
+
+ #---------------------------------------------------------------------------
+ # Property / object update manager
+ #
+ # - Manage updates when a value has changed more than a predetermined amount.
+ #   This class is designed to make updating displays (e.g. canvas), or
+ #   performing actions based on a property (or value in a hash) changing
+ #   by more than the preset amount.
+ #   This can make a significant improvement to performance compared to simply
+ #   redrawing a canvas in an update loop.
+ # - Author       : Richard Harrison (rjh@zaretto.com)
+ #---------------------------------------------------------------------------*/
+
+#example usage:
+# this is using the hashlist (which works well with an Emesary notification)
+# basically when the method is called it will call each section (in the lambda)
+# when the value changes by more than the amount specified as the second parameter.
+# It is possible to reference multiple elements from the hashlist in each FromHashList; if either
+# one changes then it will result in the lambda being called.
+#
+#        obj.update_items = [
+#            UpdateManager.FromHashList(["VV_x","VV_y"], 0.01, func(val)
+#                                      {
+#                                        obj.VV.setTranslation (val.VV_x, val.VV_y + pitch_offset);
+#                                      }),
+#            UpdateManager.FromHashList(["pitch","roll"], 0.025, func(hdp)
+#                                      {
+#                                          obj.ladder.setTranslation (0.0, hdp.pitch * pitch_factor+pitch_offset);                                           
+#                                          obj.ladder.setCenter (118,830 - hdp.pitch * pitch_factor-pitch_offset);
+#                                          obj.ladder.setRotation (-hdp.roll_rad);
+#                                          obj.roll_pointer.setRotation (hdp.roll_rad);
+#                                      }),
+#            props.UpdateManager.FromProperty("velocities/airspeed-kt", 0.01, func(val)
+#                                      {
+#                                          obj.ias_range.setTranslation(0, val * ias_range_factor);
+#                                      }),
+#                            props.UpdateManager.FromPropertyHashList(["orientation/alpha-indicated-deg", "orientation/side-slip-deg"], 0.1, func(val)
+#                                                                     {
+#                                                                         obj.VV_x = val.property["orientation/side-slip-deg"].getValue()*10; # adjust for view
+#                                                                         obj.VV_y = val.property["orientation/alpha-indicated-deg"].getValue()*10; # adjust for view
+#                                                                         obj.VV.setTranslation (obj.VV_x, obj.VV_y);
+#                                                                     }),
+#           ]
+#
+#==== the update loop then becomes ======
+# 
+#        foreach(var update_item; me.update_items)
+#        {
+#            # hdp is a data provider that can be used as the hashlist for the property
+#            # update from hash methods.
+#            update_item.update(hdp);
+#        }
+#
+var UpdateManager =
+{
+ _updateProperty : func(_property)
+ {
+ },
+    FromProperty : func(_propname, _delta, _changed_method)
+    {
+        var obj = {parents : [UpdateManager] };
+        obj.propname = _propname;
+        obj.property = props.globals.getNode(_propname);
+        obj.delta = _delta;
+        obj.curval = obj.property.getValue();
+        obj.lastval = obj.curval;
+        obj.changed = _changed_method;
+        obj.update = func(obj)
+        {
+            me.curval = me.property.getValue();
+            if (me.curval != nil)
+            {
+                me.localType = me.property.getType();
+                if (me.localType == "INT" or me.localType == "LONG" or me.localType == "FLOAT" or me.localType == "DOUBLE")
+                  {
+                      if(me.lastval == nil or math.abs(me.lastval - me.curval) >= me.delta)
+                        {
+                            me.lastval = me.curval;
+                            me.changed(me.curval);
+                        }
+                  }
+                else if(me.lastval == nil or me.lastval != me.curval)
+                  {
+                      me.lastval = me.curval;
+                      me.changed(me.curval);
+                  }
+            }
+        };
+        obj.update(obj);
+        return obj;
+    },
+
+    IsNumeric : func(hashkey)
+    {
+        me.localType = me.property[hashkey].getType();
+        if (me.localType == "UNSPECIFIED") {
+            print("UpdateManager: warning ",hashkey," is ",ty, " excluding from update");
+            me.property[hashkey] = nil;
+        }
+        if (me.localType == "INT" or me.localType == "LONG" or me.localType == "FLOAT" or me.localType == "DOUBLE")
+          return 1;
+        else
+          return 0;
+    },
+
+    FromPropertyHashList : func(_keylist, _delta, _changed_method)
+    {
+        var obj = {parents : [UpdateManager] };
+        obj.hashkeylist = _keylist;
+        obj.delta = _delta;
+        obj.lastval = {};
+        obj.hashkey = nil;
+        obj.changed = _changed_method;
+        obj.needs_update = 0;
+        obj.property = {};
+        obj.is_numeric = {};
+        foreach (hashkey; obj.hashkeylist) {
+            obj.property[hashkey] = props.globals.getNode(hashkey);
+            obj.lastval[hashkey] = nil;
+#            var ty = obj.property[hashkey].getType();
+#            if (ty == "INT" or ty == "LONG" or ty == "FLOAT" or ty == "DOUBLE") {
+#                obj.is_numeric[hashkey] = 1;
+#            } else
+#              obj.is_numeric[hashkey] = 0;
+#print("create: ", hashkey," ", ty, " isnum=",obj.is_numeric[hashkey]);
+#            if (ty == "UNSPECIFIED")
+#              print("UpdateManager: warning ",hashkey," is ",ty);
+        }
+        obj.update = func(obj)
+          {
+              if (me.lastval == nil)
+                  me.needs_update = 1;
+              else {
+                  me.needs_update = 0;
+
+                  foreach (hashkey; me.hashkeylist) {
+                      if (me.property[hashkey] != nil) {
+                          me.valIsNumeric = me.IsNumeric(hashkey);
+
+                          if (me.lastval[hashkey] == nil
+                              or (me.valIsNumeric and (math.abs(me.lastval[hashkey] - me.property[hashkey].getValue()) >= me.delta))
+                              or (!me.valIsNumeric and (me.lastval[hashkey] != me.property[hashkey].getValue()))) {
+                              me.needs_update = 1;
+                              break;
+                          }
+                      }
+                  }
+              }
+              if (me.needs_update) {
+                  me.changed(me);
+                  foreach (hashkey; me.hashkeylist) {
+                      me.lastval[hashkey] = me.property[hashkey].getValue();
+                  }
+              }
+          }
+        ;
+        return obj;
+    },
+    FromHashValue : func(_key, _delta, _changed_method)
+    {
+        var obj = {parents : [UpdateManager] };
+        obj.hashkey = _key;
+        obj.delta = _delta;
+        obj.isnum = _delta != nil;
+        obj.curval = nil;
+        obj.lastval = nil;
+        obj.changed = _changed_method;
+        obj.update = func(obj)
+          {
+              me.curval = obj[me.hashkey];
+              if (me.curval != nil) {
+                  if (me.isnum) {
+                      me.curval = num(me.curval);
+                      if (me.lastval == nil or math.abs(me.lastval - me.curval) >= me.delta) {
+                          me.lastval = me.curval;
+                          me.changed(me.curval);
+                      }
+                  } else {
+                      if (me.lastval == nil or me.lastval != me.curval) {
+                          me.lastval = me.curval;
+                          me.changed(me.curval);
+                      }
+                  }
+              }
+          }
+        ;
+        return obj;
+    },
+    FromHashList : func(_keylist, _delta, _changed_method)
+    {
+        var obj = {parents : [UpdateManager] };
+        obj.hashkeylist = _keylist;
+        obj.delta = _delta;
+        obj.lastval = {};
+        obj.hashkey = nil;
+        obj.changed = _changed_method;
+        obj.needs_update = 0;
+        obj.isnum = _delta != nil;
+        obj.update = func(obj)
+          {
+              if (me.lastval == nil)
+                me.needs_update = 1;
+              else
+                me.needs_update = 0;
+
+              if (obj != nil or me.lastval == nil) {
+                  foreach (hashkey; me.hashkeylist) {
+                      if (me.isnum) {
+                          if (me.lastval[hashkey] == nil or math.abs(me.lastval[hashkey] - obj[hashkey]) >= me.delta) {
+                              me.needs_update = 1;
+                              break;
+                          }
+                      } elsif (me.lastval[hashkey] == nil or me.lastval[hashkey] != obj[hashkey]) {
+                          me.needs_update = 1;
+                          break;
+                      }
+                  }
+              }
+              if (me.needs_update) {
+                  me.changed(obj);
+                  foreach (hashkey; me.hashkeylist) {
+                      me.lastval[hashkey] = obj[hashkey];
+                  }
+              }
+          };
+        return obj;
+    },
+};
diff --git a/test/queue.nas b/test/queue.nas
new file mode 100644
index 0000000..4a2a0af
--- /dev/null
+++ b/test/queue.nas
@@ -0,0 +1,35 @@
+# lib queue.nas
+var block_alloc=func()
+{
+    return {elem:nil,next:nil};
+}
+var new_queue=func()
+{
+    return {next:nil};
+}
+var queue_push=func(queue,elem)
+{
+    var tmp=queue;
+    while(tmp.next!=nil)
+        tmp=tmp.next;
+    tmp.next=block_alloc();
+    tmp.next.elem=elem;
+}
+var queue_pop=func(queue)
+{
+    var tmp=queue.next;
+    if(tmp!=nil)
+        queue.next=tmp.next;
+    return;
+}
+var queue_front=func(queue)
+{
+    var tmp=queue.next;
+    if(tmp!=nil)
+        return tmp.elem;
+    return nil;
+}
+var queue_empty=func(queue)
+{
+    return queue.next==nil;
+}
\ No newline at end of file
diff --git a/test/scalar.nas b/test/scalar.nas
new file mode 100644
index 0000000..09afd65
--- /dev/null
+++ b/test/scalar.nas
@@ -0,0 +1,126 @@
+# basic type
+nil;
+2147483647;
+0x7fffffff;
+0xdeadbeef;
+0o70120327;
+"hello world!";
+'hello world!';
+-12;
+!0;
+-((30));
+[];
+{};
+[0,1,2,3,4,5][2];       # 2
+[0,1,2,3,4,5,6,7,8,9,10][0,2,4:7,9];
+[0,1,2,3,4,5,6,7,8,9,10,][0,2,4:7,9];
+([0,1,2,3,4])[2];       # 2
+(([0,1,2,3]))[2];       # 2
+[0,1,2,3,4,5][5,4,3,2+1][0:2][0]; # 5
+{str:"hello"}.str;      # "hello"
+{str:"hello"}["str"];   # "hello"
+{"str":"hello\"\"\n"}["str"]; # "hello"
+20? 1:0;
+
+# normal scalar
+var number_1=1;
+var number_2=0xdeadbeef;
+var number_3=0x13702;
+var number_4=0.12341490239423;
+var string_1="hello";
+var string_2='hello';
+var string_3=number_1? 'yes':'no'; # yes
+
+# vector
+var vector_1=[];
+var vector_2=[0,1,2,"str",number_1,vector_1];
+var vector_3=vector_2[-3,-1];
+var vector_4=vector_2[0:3];
+var vector_5=vector_2[3:];
+
+# hash
+var hash_1={};
+var hash_2={str1:'str1', str2:'str2', num1:0x7fffffff};
+var hash_3={
+ "member_1":1,
+ "member_2":2,
+ "member_3":3,
+};
+var hash_4={
+ mem_1:hash_1,
+ mem_2:hash_2.num1, # also this can be written as hash_2["num1"]
+ mem_3:hash_3["member_1"]
+};
+
+# function
+var func_1=func(){return 1;}
+var prt=func(x){print(x);return nil;}
+var func_with_dynamic_id=func(a,b,c,d...){return [a,b,c,d];}
+var func_with_lack_para=func(a,b,c=1,d=2){return a+b+c+d;}
+var func_with_func_para=func(a,f){return f(a);}
+
+func_with_lack_para(a:1, b:2, c:3, d:4);
+func_with_lack_para(b:1, c:3, a:4, d:1);
+func_with_func_para(f:func prt,a:1);
+func_with_func_para(func func_1(),func(x){return x;});
+func_with_func_para(func_1(),func_1);
+prt(func func_1());
+var test_func_ret_number_1=func func_1(); # 1
+var test_func_ret_number_2=func_1();      # 1
+
+var source={
+ member_1: func func_1(),         # this will get a number
+ member_2: func {return 2.71828;} # this will get a function
+};
+print(source['member_2']());
+print(source.member_2());
+
+var test_func=func{return 1;}
+print(func test_func());       # 1
+print(test_func());            # 1
+print(func test_func);         # nothing
+print(test_func);              # nothing
+print(([0,1,2,3])[1]);         # 1
+print(({str:"what?"})["str"]); # what?
+print(({str:"what?"}).str);    # what?
+
+# lambda
+(func(x){return x>0? x:0;})(12);
+(func{print("hello world");})();
+(((func(x){return 1.0/math.exp(x);})))(0);
+
+# flexible definition & assignment
+var (r,g,b)=[0x00,0x10,0xff];
+(var r,g,b)=[0x00,0x10,0xff];
+var color=[0x00,0x10,0xff];
+var (r,g,b)=color;
+(var r,g,b)=color;
+(r,g,b)=(b,g,r);
+(number_1,number_2)=(number_2,number_1);
+var (swap_a,swap_b)=(0x1,0x80);
+(swap_a,swap_b)=(swap_b,swap_a);
+# ((swap_a),(swap_b))=(swap_b,swap_a) is wrong
+# anything that use multi_assignment must not have curve around them
+var multi_assign_1=[0,1,2,3,4];
+var multi_assign_2=[10,9,8,7];
+(multi_assign_1[1],multi_assign_2[0])=(multi_assign_1[2],multi_assign_2[1]);
+
+# calculation
+1+1;
+1+1-2+3-4+5-6;
+1+1*8-9/3;
+1*-1;
+1*(1+2*(3+4*(5+6*(7+8*(9+10/(1+1))))));
+((-1*2+9))/7-1;
+((({num:2})))["num"]*2*2*2;
+((((([0,1,2])[0:2]))[0:2]))[1]-1;
+(((((((((((((((((((1+1+2+3+5)+8))+13)))+21))))+34)))))+55))))*89;
+number_1*(number_2+number_3)/90-number_4;
+(func test_func)()-1;
+hash_3.member_3+(func {return {what:"i don't tell you.",case_small:80,case_large:100}})()["case_large"]/10;
+-1*10+5 or 10-10;
+nil and 1+7*8;
+(number_1 or number_2) and (number_3 or number_4-number_4*1);
+[0,1,4,3,2][4]*2-4+1*2*2*2*2*2/8;
+{num:0}.num or {what_is_the_secret_of_universe:42}["what_is_the_secret_of_universe"];
+"123"~"456"-123456*2/2;
\ No newline at end of file
diff --git a/test/scope.nas b/test/scope.nas
new file mode 100644
index 0000000..e38f016
--- /dev/null
+++ b/test/scope.nas
@@ -0,0 +1,62 @@
+var global_value=0;
+var global_hash=
+{
+    var1:1,
+    var2:2,
+    var3:func(){return me.var2;}
+};
+print(global_value);
+print(global_hash.var3());
+
+var func1=func()
+{
+    global_value=1;
+    print(global_value);
+    var closure_value=1;
+    var temp_value=1;
+    print(temp_value);
+    return func{return closure_value;};
+}
+
+var func2=func()
+{
+    for(var temp_value=0;temp_value<100;temp_value+=1)
+    {
+        if(temp_value<10)
+            print(temp_value,"< 10");
+        elsif(10<=temp_value and temp_value<50)
+            print(temp_value,"< 50");
+        temp_value=10;
+    }
+    return;
+}
+
+var func3=func()
+{
+    var fake_closure_value=1;
+    return func()
+    {
+        var fake_closure_value=2;
+        return fake_closure_value;
+    };
+}
+
+func1()();
+func2();
+func3()();
+
+if(!global_value)
+{
+    var temp_value=1;
+    if(temp_value)
+    {
+        var temp_value=2;
+        if(temp_value>=1)
+        {
+            var temp_value=3;
+            print(temp_value);
+        }
+        print(temp_value);
+    }
+    print(temp_value);
+}
\ No newline at end of file
diff --git a/test/special.nas b/test/special.nas
new file mode 100644
index 0000000..f581ac2
--- /dev/null
+++ b/test/special.nas
@@ -0,0 +1,24 @@
+var hash={str:'hello',f:func{return me.str;}};
+var tmp_f=hash.f;
+hash=1;
+print(tmp_f());
+# undefined symbol 'me'
+# this means that 
+# when generating local_scope for function f,
+# nasal_gc will not count 'me' as one reference of this hash
+
+var h1={str:'hello',f:func{return me.str;}};
+var h2={str:'world',f:func{return nil;}};
+h2.f=h1.f;
+print(h2.f());
+# print 'world'
+# this means that 'me' in hash's functions
+# only points to the hash this function belongs to
+
+var f1=func(){print(1);return 1;}
+var f2=func(){print(2);return 0;}
+f1() or f2();
+# print '1'
+# this means that when using 'or' or 'and',
+# if the result is clear when calculating,
+# objects behind will not be calculated
\ No newline at end of file
diff --git a/test/stack.nas b/test/stack.nas
new file mode 100644
index 0000000..610bdc3
--- /dev/null
+++ b/test/stack.nas
@@ -0,0 +1,34 @@
+# lib stack.nas
+var block_alloc=func()
+{
+    return {elem:nil,next:nil};
+}
+var new_stack=func()
+{
+    return {next:nil};
+}
+var stack_push=func(stack,elem)
+{
+    var tmp=stack.next;
+    stack.next=block_alloc();
+    stack.next.elem=elem;
+    stack.next.next=tmp;
+}
+var stack_pop=func(stack)
+{
+    var tmp=stack.next;
+    if(tmp!=nil)
+        stack.next=tmp.next;
+    return;
+}
+var stack_top=func(stack)
+{
+    var tmp=stack.next;
+    if(tmp!=nil)
+        return tmp.elem;
+    return nil;
+}
+var stack_empty=func(stack)
+{
+    return stack.next==nil;
+}
\ No newline at end of file
diff --git a/test/string.nas b/test/string.nas
new file mode 100644
index 0000000..32de8b9
--- /dev/null
+++ b/test/string.nas
@@ -0,0 +1,5 @@
+import("lib.nas");
+var filename="";
+
+filename=input();
+print(filename[0]);
\ No newline at end of file