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Is it possible to find times of past user sessions?

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linux-howto

http://unix.stackexchange.com – Using the who command, I can find which users are currently logged into a machine. I would like to determine which users have logged into my machine in the past, and the length of those sessions. Is this information retained, and can I access it? The particular machine I'm thinking of is running Ubuntu 10.10. (HowTos)