user AFK, how to detect¿?

i have read this thread.
http://www.experts-exchange.com/Programming/Languages/Pascal/Delphi/Q_20556951.html

how can i detect if there is no keystrokes or movements.
even if my app is mimimized or in tasktray?
and general cpu usage from pc
Natural_DemonAsked:
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Natural_DemonAuthor Commented:
col, i it works, i'm a regular codeproject.com user.
but i wanted to check to see what's avaiable.

thanx

and i'm a noob, who often can't understand ....
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