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First of all, I have searched and I thought I found an existing question here: Automate 3 monitors on nVidia card

But the answer doesn't work for me. Which seems logical seeing as the script first calls

C:\Windows\System32\DisplaySwitch.exe /extend

Which should extend the display to somewhere. I still don't know if it is supposed to extend to a third monitor or if it would extend to the second monitor that is already present. In either case, I don't want to extend a display, I want to switch it.

Then, it starts the application and waits for it to finish and afterwards calls:

C:\Windows\System32\DisplaySwitch.exe /external

Which should switch the display to the "Projector". I don't understand how that is supposed to switch his primary screen back to his monitor at all. If anything this should make the TV his only display as far as I can tell.

In short, I think the DisplaySwitch.exe seems to only be intended for two monitor setups. Specifically setups that run on one monitor only and then adding a second one (a projector). For this use case, I can see how "DisplaySwitch.exe /external" or "DisplaySwitch.exe /extend" are supposed to work.

My requirement: But what I want is to be able to boot my PC and have it start with my two Samsung Monitors in normal dual monitor mode as always and then be able to switch the primary screen over to my TV when starting a certain application which should return the screen back to the monitor as soon as the application exits.

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