You can quickly create IDL (Interactive Data Language) that is compatible with Visual Basic by simply building a server with the Visual Basic IDE that contains the intended interface definitions. Examine the server’s type library with the OLE View utility. The type library viewer of OLE View reverse-engineers the equivalent IDL from the Visual Basic type library. You can copy and paste the resulting interface definitions into a new IDL source file. This will give a Visual Basic compatible IDL, as anything in a Visual Basic-generated type library is always Visual Basic compatible.