How to Run Two Computers at One Desk

If you want one button that moves your screens, keyboard and mouse together, buy a KVM: the UGREEN HDMI KVM switch handles two computers across two monitors at 4K 60 Hz each and passes USB peripherals through, which is the configuration most two-machine desks actually need. If your two computers already have their own screens and you only want to share the keyboard and mouse, a plain USB switch does it for a fraction of the price.

Start by being precise about what you are trying to share, because the four options below are not substitutes for one another. There are three separate things on your desk: displays, USB peripherals, and audio. A KVM moves all three. A USB switch moves only the second. Your monitor’s input button moves only the first. Picking the wrong one is how people end up with a switch that leaves half the desk pointing at the wrong machine.

Option 1: the monitor’s own inputs (free)

Nearly every modern monitor has two or more inputs. Plug computer A into HDMI 1 and computer B into HDMI 2 or DisplayPort, and switch sources from the monitor’s own menu or button.

This costs nothing and it is the right answer more often than people expect — particularly if one of the machines is a laptop you use with its own keyboard anyway. Two limitations: the keyboard and mouse stay with whichever machine they are plugged into, and input switching on a monitor’s OSD is usually three button presses rather than one.

The upgrade on this theme is a monitor with a built-in KVM, which several business panels now have: two video inputs plus a USB-B upstream per input, so the monitor moves the peripherals when you change source. Several screens in our USB-C monitor roundup have exactly that, and it is the tidiest solution of all if you are buying a screen anyway.

Option 2: a USB switch (cheap)

A USB sharing switch has one set of peripheral ports and two host cables. Press the button and your keyboard, mouse and anything else plugged into it change computers. It never touches video.

This is the correct choice when both machines already drive their own displays — a desktop on the monitor and a laptop open beside it, say — and what you actually want is to stop having two keyboards on the desk. Combine it with the monitor’s own input button and you have a poor man’s KVM for under thirty dollars, at the cost of pressing two buttons.

Option 3: a KVM switch (one button, everything)

A KVM — keyboard, video, mouse — takes both computers’ video outputs and both USB connections, and switches the lot in one action. On a dual-monitor desk, a two-monitor KVM moves both screens at once, which is the thing nothing else on this page does.

Three specs decide whether a KVM will work for you. Resolution and refresh per display— a 4K 60 Hz rating per output is the common good standard, and anything above that needs checking carefully. Number of hosts — two is standard, four exists. What the USB passthrough actually supports— a keyboard and mouse always, a webcam or an audio interface not always, because some KVMs emulate only HID devices.

Our KVM switch roundup ranks the category properly, and docking station versus KVM switch is the comparison to read if you are unsure which device you are shopping for.

Option 4: a dock per machine (for two laptops)

If both machines are laptops, the alternative to a KVM is a dock with a single USB-C cable, and you move that one cable between the two laptops. One connector, four seconds, and no video path to get wrong. It is less elegant than a button but it has no resolution limits beyond the dock’s own, and a dock does things a KVM does not: ethernet, charging and a long port list.

For a desktop plus a laptop, this does not work, because the desktop cannot be docked. That combination is the clearest case for a KVM. The dual-monitor dock roundup and the Thunderbolt dock roundup cover the dock options.

The details people get caught by

Audio does not always follow. Many KVMs pass audio embedded in HDMI, so sound goes to the monitor, not to your desk speakers. If you use powered speakers or a USB headset, check whether the switch carries them - a USB headset usually follows the USB passthrough, an analogue speaker pair usually does not.

Cable count triples. A two-computer, two-monitor KVM needs two video cables per computer in, two out to the monitors, two USB host cables, and a power supply. That is a bundle, and it is why a tray and a proper cable plan belong in the same order as the switch.

Hotkeys beat buttons.A switch on the desk is fine; a switch behind the monitors is not. Check for a wired remote or keyboard hotkey switching before you buy, and note that hotkey switching needs the keyboard to be on the KVM’s own passthrough.

Cable quality decides the top resolutions. A KVM rated for 4K 60 Hz needs cables that can carry it on both sides. DisplayPort versus HDMI covers which standard carries what, and a certified cable is the cheapest fix for a link that drops out.

Which to buy, in one line each

One monitor, two machines, and you do not mind two button presses: use the monitor’s inputs and add a USB switch. Two monitors and one machine needing all of them: a dual-monitor KVM. Two laptops: a dock and move the cable. Three or four machines: a four-host KVM. Buying a monitor anyway: get one with a built-in KVM and buy nothing else.