One possibility would to install "yourself" as a screen-saver in the registry entry: \HKEY_CURRENT_USER\Desktop\SCRNSAVER.EXE
Can't say I have tried this though.
The API SystemParametersInfo might be of interest as well.

In reply to Re: Win32 idle state (screensaver like) by cdarke
in thread Win32 idle state (screensaver like) by thenetfreaker

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