Finding users "idle" time

Hi,

I have been searching for the past while to find out how on earth I can see how long a user has been "idle" for. Kinda like how Windows knows when to put up the screen saver.

But I can't find it anywhere. Can anyone help?

Thanks

from
Paul

Here you go http://www.planetsourcecode.com/xq/A...s/ShowCode.htm