Do you mean how to play your xbox on your laptop? You can't. If you buy a tv tuner that has composite in, there is a four second delay on all programs. That means you press the A button to shoot or whatever, and four seconds later it happens on the screen. Very annoying.
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Windows Media Center. Make sure that both the laptop and 360 are on the same network though.
You can use an ethernet cable, but you'll have to bridge the connection. More info can be found herehere and here. You also need wireless internet. hope that helps.
Actually, you don't need to bridge it, that was from something else, sorry. You do need to share the connection though. The vids will show you how.