To use NT3xli.DLL in a C++ Builder application, the following is needed:

In all C++ programs, 
	#include "NT3xliMF.h"
That is MFC version of the header file for NT3xli.DLL

In all C programs, 
	#include "NT3xli.h"
That is MFC version of the header file for NT3xli.DLL

Create library file for this DLL:
	implib -c OMSDLL.lib NT3xli.DLL
That creates Borland LIB file.

Add to the project library file (OMSDLL.lib)

Make the application.