How to backup wlan configuration?

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http://unix.stackexchange.com – I'm using Lubuntu 11.10 and I'd like to copy all files containing the configuration to access all wireless network which I usually use. At home or at office it connects automatic. I know that I can edit the connection using the icon but I believe that there is a file containing the login and passwords and all the protocols, anyway, all the set up to the wireless connections. Any help? (HowTos)