If you are doing a presentation and wants your desktop to be captured to the video (instead of the camera pointing at the screen) download and install the following:
For Mac: http://www.varasoftware.com/downloads/DesktopPresenter.dmg
Windows: http://www.varasoftware.com/downloads/DesktopPresenter.exe
In Windows, it helps if you install Bonjour for Windows:

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