How to find last login user on given computer name on AD

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http://serverfault.com – If anyone could help, it would be appreciated. I am trying to audit the network. I have list of computers that are active in last 3 months in domain. I have little script that run when user login to the computer and writes the file with computer name. I have 39 computers and only on 23 computers the script was run. So I am chasing up with other 16 computers. My question is how can I find out who has last login to the given computer name? Many thanks in advance (HowTos)