One example would be :-
Category: Software Metering
Report Name: Computers that have run a specific metered software program
Have a look at the other reports in that category also. If you've just enabled the rule you won't see anything for a week or so. You won't get the information as specific as betweeen certain hours, but you will certainly get average usage per day.
If you have a policy on screen savers, you could stick the executable for the screen saver in as well. That would give you an idea of who'd logged in, but pretty much doing nothing.
Regards,
Tom Watson,
E-Mail: Tom_
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Blog: http://myitforum.com/cs2/blogs/tom_watson