Utilities to monitor computer usage
Does anyone know of any good FREE utilities that can monitor computer usage. Essentially something that can detect log in sessions of users. The majority of our computers are woken up remotely every week day and shut down remotely every night so they are on an ready for the users. I need a utility to justify cutting back on a couple computers in a certain department that keeps asking for more but I know they do not use the ones they have already. They basically have a 2.2:1 computer to user ratio and only want more because it is too "inconvenient" to walk 50 feet down the hall to use one that is available.
So if there is something that can show when a user logs in and then logs out and how long their session was that would be awesome. Something I can search against and maybe even get weekly reports.
If you know of any paid utilities please suggest them as I can try and get them approved. I used a program called UserLock in a past job that could do that and also lock out user sessions but I was asked to try and find something free first.