It’s a device where you can plug in things like monitors, mouse keyboard, etc and then that plugs into both PC’s and you can switch back and forth without having to unplug anything. here is an example of one . 4K@120Hz DisplayPort KVM Switch 2 Computers 2 Monitors DP1.4, KVM Switches Dual Monito 8K@60Hz with 3 USB 3.0 Ports Share Keyboard Mouse Printer (EDID Plug and Play) and Wired Remote, USB3.0 Cable*2 a.co/d/h9vJ0Uu