how to understand if the comp. is idle?

[DVirus]

hi..
I need to check if computer is idle more than 3 minutes..
I did it by checking mouse pointer.. But sometimes
user just using keyboard and mouse pointer(x,y) is
getting wrong.. So, I need to detect IDLE like windows'
screen-saver process.. How can I detect if computer is
idle (probably some minutes that I can set)...
Thanks..

 

[LorenPechtel]

Global message hook looking for any wm_Key or wm_mouse messages. This tells you if there's a human, not if the computer is doing something that doesn't need a human, though.