I can understand how a wired network handles redirections and what-nots since it uses hard-wired IP adresses, but I don't know how a wifi access point decides how a wifi user joins a SSID-named network: does the protocol scans which canals have the less interferences, and assigns frequencies to the best one ?
What if conditions change ?
Does it assigns frequencies a little like ADSL ?
How does two user can send/receive data with the correct addresses without interfering with each other ?
How can a network be kept "hidden" ?