Airport Express Setup (Score 1)

Oddly I had two Airport Express units in different parts of my flat at one stage when living with an ex. I was able to logon to my account on an Apple iBook stream to one of them. Then logon to a different account and then stram to a different airport express unit. No issues. I shared the same location on iTunes without any problems. Reckon you could do it with more and easily switch between users.