What I have used which works good is DameWare Remote control.
However, if ur gonna try and play a game on the laptop that is loaded on the desktop its not gonna happen.
You can also look into DynDNS. If you have the Home version of XP go to Microsoft and download the app Remote Desktop. Install it and your favorite connection protocol and you should have no problems. Just make sure the router is also setup to accept the remote connection. Might have to reconfig the router.
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