I have an airport extreme set up with a wireless network running on N 5ghz. I do not own the newer model which can broadcast both N and G at the same time. I also have 2 airport express systems set up to extend this network. Somehow, my flatmates laptop, which only supports 802.11abg can see the network and even connect! What is going on? There is one other G router in the building which is for our internet, which is wired by ethernet to one of the express.