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Hey does anyone know of a program (preferably free) that monitors how long a user has been on a computer for.

Becuase me and my brother always have arguments about whos turn it is ect. and he lies alot and says hes only had an hour when hes actually had about 6.

I dont want something that monitors what you go on ect, just how long someone has been logged in for.

Thanks
Solaris