Need help with aviCap32

I need to know how to use the avicap32.dll command to create a capture window.

capCreateCaptureWindow%(lpszWindowName$,dwStyle%,x%,y%,nWidth%,nHeight%,hWnd%,nID%)

and i was wondering if there was a way to mask the the incoming image so I could do like a "green screen" kind of thing with it. Thanks to all who help me!! (and some who don't...)

Does anybody even know how to use this command?

Maybe this can help you:
http://blitzbasic.com/Community/posts.php?topic=65782

Thanks, that's exactly what I needed.