In this thread it was mentioned how a software could manage single/multiple monitors.  I was curious to see how it could be possible to make it work without the tool. So I made a script that change brightness (VCP 10) of my primary monitor for a few seconds.  To learn about the VCP commands refer to : Among other commands, you can turn on/off (VCP D6) secondary monitor, change contrast (VCP 12), etc.  In the example you can see (and parse) a