I wish to replace the rental DVR I get from Comcast, so I have investigated PC HD tuner cards (plus, I have many extra hard drives). I want to watch my cable on a TV and still be able to use my PC as a computer. Does such a device exist?
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Unfortunately, going full screen in Windows Media Center all but disables the secondary screen. If you don't mind watching cable on your TV in Windowed Mode, it'd work fine. I don't know of any way around this.