The Extend Mode, as its name implies, lets you turn your second device into an extended desktop for your PC. This comes in handy when you want to increase your overall screen workspace.

It handles basic tasks like file transfer and screen mirroring, but the real draw is its Extend feature, which turns your phone or tablet into a second monitor for your PC.

I want to check on a computer whether it actually uses a second display, either as an extended display or for mirroring its primary display. I'd prefer Powershell, of course.