Can a Windows Service do something when a computer "goes to sleep"?

[Yuan Wong]

I've tried some functions in service on S3.

Success : Received NetworkAddressChanged Event　　
Fail ：1. get key event(I know it's about security.)
　 2. get windows OS version by WMI command
　 3. timer
4. simulate key press by keybd_event
5. wake up system with SetWaitableTimer

It seems the service can only receive message and do nothing like file transferring while the system is asleep.

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