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I want to capture the system idle time. Means if the user did not press any key or did not move the mouse then it is considered as system idle time. I want the code for this in C/C++ on windows operating system. Please help me.

Thats Win-API stuff. Use [url]msdn.microsoft.com[/url]

Make a thread, of the lowest priority. Count how long this thread is active. That's your system idle time.