... (Most people wind up hiding the hub in a closet, and running the wiring either along the edges of the room or inside the walls.) You can buy Ethernet cables, plus the hub, at any computer store ... need an Ethernet hub. Instead, you just need a standard Ethernet cable. Run it directly between the Ethernet jacks of the two computers. (You don't need a special crossover Ethernet cable, ... think about it, the AirPort system is a lot like a cordless phone, where the base station is, well, the base station, and the Mac is the handset. The base station can take any of these forms:...