or if you really want to get paranoid, you can set the router to only accept connections (within the network) from the MAC address of each PC. You can get that from a DOS prompt by typing 'ipconfig /all |More' (allows you to look at each screenful individually). Get the MAC addy for each machine, then set up the security option to do that (varies by vendor and OS, otherwise I could tell ya).

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)