That’s a reverse keyboard shortcut.

Here’s another one: When you have multiple windows open, grab one by the title bar with a click-and-hold and shake it around with your mouse. This will cause all your open windows except the one you grabbed to minimize.

I don’t know how the fuck anyone is meant to discover that naturally, or what would possess anyone to even try. I think someone at Microsoft just put it in there as a joke, so people can incessantly post this exact same “did you know this thing about Windows???” thing on the internet constantly.

In other news, double clicking the window menu (in the upper left, aka the “staple box”, which later became the mini-icon in Windows 95 and later) to this very day is a shortcut to close a window that nobody who isn’t old enough to remember what 5.25" floppy disks looked like will know about. This is a holdover from, I believe, Windows 2.0. But it still works in modern Windows to this very day.