I'm working in a home/home-office environment right now which was setup by someone else and I've noticed some odd network behavior when moving about the property. Looking at the setup, the relevant portion is: Cable modem - Airport Extreme - 10 port wired switch - 3x Airport Express in different areas of the house. The configuration of each device has the Extreme and all three Express devices set to "create a wireless network" with the network name the same for all four of them. I am not a networking expert but I would have thought that the Extreme should be set to be the "master" in a WDS network and the Express should each be set to participate in that WDS network. If they're all hosting their own wireless network with the same name and the coverage overlaps, how does a PC know which one it's using? Or maybe this doesn't matter. I just know that when we move from one room to another we frequently have to re-select the wireless network to establish connectivity.