I ordered an airport express with my powerbook. I'm going to be taking it to college. Now that wifi is becoming popular in laptops windoze or mac, anyone can just sign on into any network. If i want to use my airport express in my dorm, can i set it up so that only my powerbook could use it, and block out others. Can i set it up so it can't be regonzied by other computers? because i don't want someone to go on using my connection....