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This function requests that Power Manager release a power requirement previously set with SetPowerRequirement. Applications and drivers should always explicitly release their power requirements as soon as they cease to be necessary.
DWORD ReleasePowerRequirement( HANDLE hPowerReq );
[in] Specifies a handle returned by a previous successful call to SetPowerRequirement.
Indicates an invalid handle.
- Win32 error code
Used for all other errors.