How to Use One Monitor with a Laptop and a Desktop. If you own a laptop and a desktop computer, you can connect both computers to the same monitor using a KVM switch. Using one monitor will allow you to avoid investing in a second monitor and enable you to view your laptop's display on a larger screen. Here is how to use one monitor with both a laptop and a desktop.
Understand the function of a KVM switch. A KVM switch is short for Keyboard, Video, Mouse switch. Its function is to connect a keyboard, monitor or a mouse to more than one computer.
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Buy a KVM sharing switch. Ensure that it has at least two ports to connect to the laptop and desktop. You need a KVM switch with a PS/2 connector to attach the monitor.
Connect the monitor to the sharing switch.
Connect the base of the sharing switch to both the laptop and the desktop PC. This base is also connected to a small remote controller, which stays on the desktop.
Switch between the two computers by pressing a button on the remote controller.