Examples Delphi

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  4. Turn off the monitor
// turn it off:
SendMessage(Application.Handle, WM_SYSCOMMAND, SC_MONITORPOWER, 0);
// turn it on again:
SendMessage(Application.Handle, WM_SYSCOMMAND, SC_MONITORPOWER, -1);
Caution: you must ensure the monitor being turned on again after you use this command, otherwise the system must be rebooted!