Hello! First-time poster, long-time reader here. I ordered my first ever mac on Friday, using my corporate discount and Black Friday promo. I purchased a 20" iMac, 2.16 GHz C2D, 2gig RAM, 256 VRAM, 250 HD, Applecare, etc. At such a bargain I rushed to purchase it before the day was over. In my rush, I now have a question for you mac experts. The iMac I ordered comes with a built-in Airport Extreme Card, but does that mean I will be ready to connect to my apartment's wireless network or do I have to purchase something else?