Using COM Instead of Normal DLL Entry
In Visual B++, you can define a more structured interaction with other languages by using COM for your communications. That is, you can use objects defined via a type library that have been implemented in other programming languages like Visual C++. (Indeed, it's difficult these days to not use COM in any Visual C++ development, just as it is in Visual B++.)
However, using COM you can also use objects defined in Visual B++ from, say, Visual C++ or Visual J++. Of course, COM is Microsoft's standard protocol for integrating independently developed software components, so here's a better look at how the connectivity is achieved.