It's Windows XP Home + software to use your TV Tuner/DVD ROM (you must provide the DVD Decoder)/Picture viewer w/remote. You have to have a supported PVR card (standard TV Tuner cards DO NOT WORK). There are some more features like online TV guide, etc...
I run it right now. Recording and playback quality is poor compared to even the most basic TV Tuner s/w out there.
$170 is a fair price. (I paid $180 wholesale for mine). If you're willing to go $100 as a last resort, I'll definitely take it.
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2010 BMW 335D - Many mods to come!