Windows XP includes a feature that allows you to access your computer while on another computer (as long as your computer is logically connected to the Internet or to the other computer via networking). To utilize this, go to Control Panel -> System -> Remote; check “Allow users to connect remotely…”; press “OK.” Now, if you or another user wishes to connect to your PC, all he/she has to do is go to Start -> Programs -> Accessories -> Communications -> Remote Desktop, type in your computer’s name or IP address, and press “Connect.” Of course, if you are behind a router with NAT, a hardware firewall, or other such security measures, you may have to configure any such devices to allow Remote Desktop traffic on port 3389. (It is also important to note that Remote Desktop is only an XP feature, and only XP Pro can actually connect to remote desktops. However, both XP Pro and Home allow a desktop to be accessed remotely.)