Yeah, I read the whole article looking for any meat in there and there is none. I played with different setups as I, too, use both macos and linux. I remember doing a two screen setup where if you move the mouse to the edge of the linux screen, it appears on the macos one.

I guess everything old is new again?

A two screen setup is not a one screen setup. I have a two screen mouse-edge setup and I was still interested to learn about being able to use a keyboard shortcut to control a monitor with a built-in KVM to switch between two computers on the same screen. That is, in fact, new to me.