Ok, so if i'm running a wireless router, how can i tell if there are other people pirating my signal? On a related note, for some reason, i cant seem to hook up my computer to my roommates' computers. the two of them are linked, and i can get online, but i cant get on the network to share files. my computer will show up on my roommate's, but they cannot access my computer. i cant even see them from my computer. (win xp, used network setup wizard). any comments welcome. thx..