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This might be an overly simple answer, but there are freeware programs out there that can monitor the status of PC's via a simple Ping test. It will basically poll a set list or a range of PCs at a frequency you specify and report back if the machine is "alive" or unreachable. You could then do whatever you wanted with the data, something like check which machines were alive at lunchtime or 4pm or whenever, and then check to see which machines became unreachable after 7pm, etc.
-- Tom
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