You want something like FTP or Remote Desktop, depending on what you want to do.
If both computers have Windows XP Pro you can remote desktop into either computer from the other. That will require a VPN (Virtual Private Network) connection between your home and office computer though. Ask your IT or MIS about VPN access, typically you create a new network connection on your home PC that connects to your company's VPN. Enable Remote Desktop in your Home / Work PC (Control Panel -> System -> Remote), then leave it logged on the network when you leave (I suggest turning on password authentication for your screensaver though). At the other computer, load up Remote Desktop (Start -> Programs -> Accessories -> Communications -> Remote Desktop), type in the computer name of the computer you want to connect to (find this at Control Panel -> System -> Computer Name), the domain (e.g. company.net), the user and password for that computer, and you're in. If one has XP Home and the other has XP Pro, you can only Remote Desktop into the Pro version from the Home version and not vise-versa (I think).
If you just want access to your files, then it would probably be better to set up an FTP server, Google on Windows XP FTP Server for more information on that.
This isn't an HTML question though, as it is more a networking issue, so you're not likely to get much help here. Google on XP remote desktop, VPN, and the like for more information.
HTH!
Regards,
Rich
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