[_m3]

Z.B. mir Windows XP:
http://www.pcmag.com/article2/0,1759,842888,00.asp
oder fuer die Techies:

Since a station always includes the SSID in the ASSOCIATE message, it can be forced to expose a hidden
WLAN through a simple active attack. To do this, an attacker simply sends a forged DISASSOCIATE
message to an active station, seemingly coming from the AP. Within seconds (at most 30), the station will
REASSOCIATE, exposing the SSID. This simple attack means that the only WLAN that can be
successfully hidden is one that is not being used.

http://www.icsalabs.com/html/communi...sid_hiding.pdf

http://bengross.com/wireless.html (unter Wireless software tools and utilities)
http://www.airmagnet.com/products/laptop.htm