FAQS, read them. (takes 2 seconds to google and find)
1.0 General Questions
* 1.1 What is XLink Kai?
XLink Kai is a program that you run on your PC or Macintosh that allows you to play system-link / LAN-enabled games for your XBox, Playstation 2, Gamecube and PSP.
The software is referred to as what is known as a 'tunnelling' application. There are various other single-console tunnelling applications available, but XLink remains the only one to support all 3 major consoles...
* 1.4 What games can I play on XLink Kai?
Simply put, any game on the XBox, Playstation 2, Gamecube and PSP that supports system-link / LAN play. What you see on this list is what Team XLink have set aside arena's for (see: 3.1 What are Arenas?).
* 1.9 Does that mean I can play games on my harddrive (XBox)?
Indeed, if that is what you want to do. You can always play games from your backup DVD's too if you like. In fact, load the game any way you want - we don't care.