Hi guys! I been googling and searching for an answer for this question...and all of them say to go through the router. But I was just wondering if there is a way to block computers from using my wireless? Here is the deal... I have a router set up which uses a WPA password. I live in a apartment building so I gave the password to some of my close friends to use. I monitor who is on my network through just looking at the "shared" section on my finder window. I can tell which computers belong to my friends, but every once in a while, an unknown computer pops up. I believe I have seen 3 unkown computers (PC's) - and they do not use the net frequently. I would like to block these computers when they come up. Is there a way to do this without going into the router settings and adjusting those protocols?