Two computers, one monitor. Reclaim runs on your Mac and switches the monitor between the two with one shortcut. Press it on your Mac's keyboard to send the screen to the other computer. Press it again to bring it back. You never have to see the Mac's screen to do it, and you never have to touch the monitor's buttons. Nothing is installed on the other computer. Nothing to set up either: Reclaim reads both inputs from the monitor itself. No permissions, no network, free.