I downloaded free software from NCH Software which let me setup this functionality in just minutes. You can get the software here: http://www.nchsoftware.com/capture/index.html
When you first start the software, it will use the webcam by default but you can go into the Options and under Webcam/Capture Device, choose USB 3M DocCam. That's it and you can start capturing video. I found that using .wmv where it shows 'Record Web Camera as:' gave me the best quality video playback.
If you have other questions about using the CL900 cameras, you can check out this article in the Motion Computing Knowledge Base.
Enjoy!
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