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I haven't completely figured out how to get access to the video stream in !WinNT. 

I'm using Video for Windows with a Connectix !QuickCam, 
as well as an Intel Video Capture Card, and it seems to assume that you are only writing to a file or previewing into a window. 

Windows tries to take over the system and doesn't really provide any stable hooks (unlike IRIX). If anyone knows how to deal with this, please let me know.