Not quite sure what you mean exactly
I have my G5 plugged into the campus network, and my G5 has an Airport card in it. Id like to use OSX's internet sharing feature to allow my PowerBook to access the internet over Wifi since there isn't campus wireless in my dorms. However, if IT discoveres a DHCP server on the network, they aren't too happy and will ban people from the network for a few days, so I'm trying to avoid that.