How to Control Multiple Computers With One Keyboard and Mouse: Software vs KVM in 2026

You can control multiple computers with one keyboard and mouse in three ways: free or paid software that shares your input over the network (Mouse Without Borders, Logitech Flow, Deskflow, Synergy, Apple Universal Control), a multi-device keyboard and mouse that switch between paired computers at the press of a button, or a hardware KVM switch. For two or three computers on the same desk, each with its own monitor, software is usually the cheapest and smoothest option: you just move the cursor off the edge of one screen and it appears on the next. A hardware KVM only becomes the better choice when the computers share a monitor, need control before the operating system loads, or sit on a network you cannot rely on.

The three approaches compared

Software options worth knowing in 2026

Mouse Without Borders

If every machine runs Windows, start here. It is part of Microsoft PowerToys, links up to four PCs with a security key, and arranges them in a row that matches your desk. You can drag files between machines and share the clipboard. It requires the computers to see each other on the local network.

Logitech Flow

Flow piggybacks on Logitech’s Easy-Switch devices. Each computer is paired to a different channel on the mouse (and optionally the keyboard), and Logi Options+ handles the cross-screen movement over the network. It is the simplest cross-platform option if you already own a Flow-capable mouse such as models in the MX line, but it is tied to Logitech hardware and caps at three computers.

Deskflow and Synergy

Deskflow is the free, open-source upstream project behind Synergy and the best pick for mixed Windows, Mac and Linux desks. Synergy is the commercial build, worth considering if you want support or a polished installer. Both use a server computer (the one with the physical keyboard and mouse) and client computers that receive input.

Universal Control

For Apple-only setups, Universal Control lets one Mac keyboard and trackpad drive other Macs and iPads signed into the same Apple Account, with Bluetooth and Wi-Fi turned on and the devices close together. No extra software needed.

Step-by-step setup that avoids the usual problems

1. Pick the main computer. Plug the keyboard and mouse into the machine you use most; it becomes the host or server.
2. Put every computer on the same network, preferably wired. Ethernet keeps cursor movement smooth; busy Wi-Fi can add noticeable lag and stutter.
3. Install the same software and version on each machine. Mismatched versions are a common reason connections fail.
4. Allow the app through the firewall. Windows will prompt on first launch; approve it for private networks only. Deskflow and Synergy commonly use TCP port 24800.
5. Arrange screens to match the physical layout. If the laptop is on the left, place it on the left in the app, or the cursor will exit the wrong edge.
6. Grant permissions on macOS. Accessibility and Input Monitoring permissions are required for any tool that controls a Mac.
7. Set a hotkey to lock the cursor to one screen during games or full-screen apps.

Limits of software sharing

• No control before login or in BIOS. Software runs inside the operating system, so it cannot type a BitLocker PIN, enter BIOS or, in some tools, interact with elevated Windows prompts.
• Games and full-screen apps. Games that capture the mouse can trap the cursor or receive jittery input. Lock the cursor to the gaming PC or plug a mouse into it directly.
• Work laptops. Corporate security policies may block these apps. Check with IT before installing.
• Network dependency. If the host loses network, the other machines lose input until you plug in a spare keyboard.

When a hardware KVM is the better answer

Choose a hardware KVM if the computers share one monitor, if you need control during boot, or if a machine is not on your network, such as an isolated test PC. Modern KVMs support USB-C, DisplayPort and HDMI at 4K, and some act as docking stations. They cost more and add cables, but they work regardless of the operating system.

Which option fits your desk

Bottom line

For most two- or three-computer desks where each machine has its own screen, install free software first: Mouse Without Borders on all-Windows setups, Logitech Flow if you already own a compatible mouse, Deskflow for mixed systems and Universal Control for Apple gear. Move to a multi-device keyboard and mouse when software is not allowed, and to a hardware KVM when monitors are shared or you need control before the operating system starts.