I've just moved into a townhouse that is prewired with CAT5 cable throughout the entire house. How do I use this cabling to network two PC's in different rooms upstairs? I also have a XBOX and GameCube downstairs that will use broadband to access the Internet in the near future. What hardware do I need to buy and how do I configure the network so that all four systems are using the same Intenet connection. I know a little about routers and home networks but I'm not sure how this all works when the house is prewired. BTW, I'm using AT&T Broadband as my ISP. Any help would be much appreciated.