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To clarify, I mean time spent while the system is suspended/hibernated, not the calling thread (GetTickCount() returns the number of milliseconds since system boot).
As far as I know, GetTickCount is unrelated to threads and counts the time since the system has started. But it is better to use GetTickCount64 to avoid the 49.7 day roleover.
By the way, to get what you want you need the GetThreadTimes function. It records the creation and exit time and the amount of time the thread has spend in user or kernel space. So you have a nice way to calculate the amount of time spend.
Ok, I missed the ‘system’ part of the question. But that is simple. When in hibernation GetTickCount continues the counting. Because people have suffered from the 49.7 days bug when the computer was in hibernate most of the time. See link text here for more information.