DISPATCH

I'm tring to learn how to use activeX controls in my C++ programs but have
hit a stone wall. I have a server control that's suppose to pass the
clients name and password. The VB example shows it as User.Name and
User.Password

VC has the function declared as:

OnUserLogin(LPDISPATCH User, BOOL FAR* Cancel, BSTR FAR* Message)

I can't figure out how to get the user's name and password. Can any one
help?