how do i crack wpa2?

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http://www.backtrack-linux.org – ive had luck with standard wpa cracking. by my understanding, you just deauth the connected user, and capture his handshake request. then use a password database and it eventually, finds the password. on many wpa2 networks i notice their arent any clients connected! why is this? also, is there a way to crack the connection without using deauth? any suggestions peeps? (HowTos)