SSID
The Service Set Identifier (SSID) controls access to a given wireless network.
This value MUST match the SSID of any/all Access Points that you want to
communicate with. If the value does not match, you are not granted access to the
system. It can be up to 32 characters long. The SSID is case sensitive. You can
have up to three SSIDs. SSID2 and SSID3 are optional, and are for use if you have
the need to roam between up to three distinct networks. For example, the
wireless networks of two separate buildings could have different SSIDs, and a
network administrator might need a laptop that could be used for both buildings
without having to re-configure the card each time.