Right, so would this work then?

Lets say I have 4 pc's, and a laptop. One PC is next to phone line socket anyway so I connect up like this;

phone line > 2port router modem. 1 port on router connected to PC via cat5 cable, 2nd port has wireless access thingy plugged into it.

Then the other 3 pc's (all running XP SP2) and the Laptop all have the USB wi-fi key plugged in, and they should all connect to my wireless access point and all "find" the net

Will this work?

Just thinking of when my bro moves into his new place, he will want BB, has 2 PC's and his missus has a laptop - so this wifi business will probably be easier than running cables everywhere, specially since all the decorating has already been done (don't think he wants to channel out the walls to run conduit and cat5 upstairs etc)