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value as stated in the MSDN library article about WM_SYSCOMMAND. notice the 0xFFF0 mask, it's because the system can use the 4 low order bits of the wParam If (msg = WM_SYSCOMMAND) //Intercept System Command Private IntPtr MessageProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)

SendMessage(Handle, WM_SYSCOMMAND, SC_MONITORPOWER, MONITORSTANBY) SendMessage(Handle, WM_SYSCOMMAND, SC_MONITORPOWER, MONITORON) SendMessage(Handle, WM_SYSCOMMAND, SC_MONITORPOWER, MONITOROFF) HwndSource source = ((HwndSource)PresentationSource.FromVisual(visual)) SystemEvents.PowerModeChanged += SystemEvents_PowerModeChanged Private static extern int SendMessage(IntPtr hWnd, int hMsg, int wParam, int lParam) static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam) Private const int SC_MAXIMIZE = 0xF030 // dont know Private const int SC_MONITORPOWER = 0xF170

Private const int SC_CLOSE = 0xF060 // dont know Private const int SC_SCREENSAVE = 0xF140 Private const int WM_SYSCOMMAND = 0x0112 I dont know how to retrieve the display/screen EVENTS private const int WM_POWERBROADCAST = 0x0218 How do I know when the screen is going off or on. Hi I have been searching but I can't find the answer.