Ok, again, this will be my first Mac. The Airport Extreme Card. How exactly can i use that? Say the internet cable is plugged into the mac pro. Can I then use that AEC inside to act as a router or sorts? So if i'm using my iTouch downstairs, can I access my Mac Pro upstairs for internet usage and can I also get my iTunes music off it with an iTouch? Just need an idea of how this card is used. Thanks.