I just bought a Linksys wireless router today to take advantage of my Tibook's airport card. I have the main line connected to my PC and access it wirelssly with my powerbook. My question is, how do I know if my setup is secure? I mean once I connected my cable modem and router to my PC, I turn my powerbook on and BAM! I'm on the internet, zero config. I like the zero config, but I live in an apartment, so what is keeping someone in my building from doing the same thing I did with my powerbook and moochin off my connection?