Can any two Airport products be used as multiple instances of one network? A friend of mine has an office in a finished shed behind his house. He's got an Ethernet cable connecting it to the wireless router in his house. We're replacing the router with a Time Capsule (for his MB). Which product would be best to use in the shed (basically need an Access Point and an ethernet switch?) Can the Express do that or does he need a base station? Never mind, found a doc on Apple's website, any "Extreme" or newer product can form a WDS network.