What the heck are you talking about? You -cannot- use a USB cable, because USB does not support peer-to-peer networking. You can have only one host on a USB network. Besides, the machines are already connected together via Ethernet!
And why involve high-speed internet?
All you need to do is:
1) enable filesharing on both PCs
2) share a folder on one (or both)
3) connect to one PC's shares with the other.
Problem, let me know if you don't know how to do any of these steps, and I will explain them in more detail.
ONe thing, once I make that file can I just search for it (using XP's search) on the computer that I did NOT make the file on? And hows about that mater slave thing, does that pertain to anything at all? Thanks guys.
P.S.- Thanks for the suggestion however the computers are too far apart and I already have LAN hooked up.