[This is preliminary documentation and subject to change.]
The PBT_APMRESUMESUSPEND message is sent as a notification that the system has resumed operation after being suspended. A window receives this message through the WM_POWERBROADCAST message.
dwData = (DWORD) lParam;
 
No return value.
Applications can receive this message at any time without a preceding PBT_APMSUSPEND message.
  Windows NT: Requires version 5.0 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in pbt.h.
Power Management Overview, Power Management Messages, PBT_APMSUSPEND, WM_POWERBROADCAST