There's a server machine where you connect the keyboard and mouse and client machines that just have a monitor connection. You arrange the geometry in the soft

There's a server machine where you connect the keyboard and mouse and client machines that just have a monitor connection. You arrange the geometry in the software to make the mouse move between machines in an intuitive manner. Whichever machine has the mouse has the keyboard input as well. So you do need a dedicated monitor per machine from my experience.