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(From the top of my head, so if I'm wrong, I'll hold up my hands and say I'm wrong - it has been a couple of years):
You'll be needing to create a COM component out of your C++ code, install it on your webserver, and then call it through standard ASP methods, similar to the way you might create a DB CONN connection and pass data in and out of it.
Hope thats of some help,
JP