From [this stackoverflow](https://stackoverflow.com/questions/713498/turn-on-off-monitor/14698416#14698416)
```c
#include <windows.h>

int main() {
  mouse_event(MOUSEEVENTF_MOVE, 0, 1, 0, 0);
  Sleep(40);
  mouse_event(MOUSEEVENTF_MOVE, 0, -1, 0, 0);
}
```