Hmm... I suppose it has support for 256 computers, but only 2 ports for additional hardwired computers, right? So there are three ports total, 2 ethernet jacks and 1 wan? Into the wan, you could stick another hub if you had one... that would expand your hard wired capability, but if you wanna use more wireless you should be able to stick it in with no problems. I'm still wondering about xp compatibility though.. I'll have to check that.