Example uses Borland Delphi 3.0 or later to bind with Visual Prolog DLLs:
(..\..\DLLS\EXE\DLL1.DLL)
(..\..\DLLS\EXE\DLL2.DLL)
You should copy these files to this directory before run the example.
You can do it with help COPYDLL.BAT file.
Project DLPH_VPI.DPR should be loaded by Borland Delphi 3.0.
DLL1 creates custom control in dialog with Denmark map.
DLL2 shows work with callback and retrieving string value.
Note: DLL1.DLL uses file DENMARK.DBA. You should run application from this directory or copy DENMARK.DBA to working directory.