Working across multiple independent computers at a single desk—such as a personal desktop workstation alongside a corporate laptop—traditionally creates desktop clutter: you have multiple keyboards and mice crowding your desk, or you rely on expensive physical hardware KVM switches that require manual button presses. While software KVM solutions exist, many are costly or require third-party cloud accounts. Integrated into Microsoft PowerToys, Mouse Without Borders is a free, official utility that enables users to control up to four distinct Windows computers seamlessly using a single mouse and keyboard while sharing a universal clipboard and enabling cross-PC drag-and-drop file transfers.
How Mouse Without Borders Operates Across Your Network
Mouse Without Borders operates through local peer-to-peer network encryption:
- Local Wi-Fi or Ethernet Communication: Input signals travel across your local area network (LAN) over encrypted TCP ports, delivering near-zero pointer latency without transmitting data to external cloud servers.
- Virtual Border Flow: When your mouse cursor pushes past the right or left edge of your primary monitor, the pointer jumps directly to the adjacent computer’s screen, simultaneously redirecting all keyboard keystrokes to that machine.
- Shared Clipboard & File Transfers: Copying text, screenshots, or files (up to 100 MB) on PC 1 allows you to paste them immediately onto PC 2.
Step 1: Install Microsoft PowerToys on All Target PCs
Every Windows computer you wish to connect must have Microsoft PowerToys installed:
- Open the Microsoft Store on your Windows 11 PC, search for
Microsoft PowerToys, and click Install. - Alternatively, open Windows Terminal and install via Windows Package Manager:
winget install Microsoft.PowerToys - Repeat the installation on your second, third, or fourth Windows PC.
Step 2: Generate the Security Key on Your Primary PC
To establish secure, encrypted pairing between machines:
- Launch Microsoft PowerToys on your main computer (the PC whose physical mouse and keyboard you will use).
- In the left sidebar, scroll down and click on Mouse Without Borders.
- Toggle the main switch to On.
- Click on New Key to generate a secure authentication string.
- Note the generated alphanumeric Security Key and your computer’s PC name displayed on the screen.
Step 3: Pair Your Secondary Computers
On your second Windows computer:
- Open Microsoft PowerToys > Mouse Without Borders and enable the feature.
- Click the Connect button under the device pairing section.
- Enter the exact Security Key and PC name generated by your primary workstation.
- Click Connect. Within a few seconds, the connection status indicator changes from searching to a solid green connected state.
Step 4: Arranging Screen Layout for Natural Navigation
In the PowerToys settings on your main PC, configure device layout:
- In the Device layout matrix, you will see icons representing each paired machine.
- Click and drag the computer icons horizontally or vertically to match their physical arrangement on your desk (e.g. laptop on the left, dual-screen desktop on the right).
- Click Apply.
- Now, push your mouse pointer off the chosen edge of your primary monitor. Your cursor transitions effortlessly onto your second computer’s screen, and typing on your keyboard now controls that machine.
Key Operational Features and Shortcuts
- Universal Clipboard: Press Ctrl + C on a document in PC 1, glide your pointer to PC 2, and press Ctrl + V to paste formatted text or images instantly.
- Cross-PC File Copying: Drag a file from File Explorer on one machine, drag it across the screen boundary, and release it onto the desktop of the second computer.
- Simultaneous Control (Broadcast Mode): Press Ctrl + Alt + Shift three times to enter Broadcast Mode, where mouse clicks and keyboard typing replicate simultaneously across all linked PCs.
Mouse Without Borders vs Hardware KVM vs Remote Desktop
| Dimension | Mouse Without Borders | Hardware KVM Switch | Remote Desktop (RDP) |
|---|---|---|---|
| Hardware Cost | Free (Open-source utility) | £50 – £200+ | Free / OS Included |
| Transition Delay | 0 seconds (Seamless edge flow) | 3–5 seconds button delay | Requires app window switching |
| Monitors Required | Each PC uses its own screen | Share 1 single monitor | Renders remote PC inside window |
| File Drag & Drop | Yes (Native peer-to-peer) | No | Clipboard redirection only |
Troubleshooting Common Connection Issues
If your cursor refuses to cross screen borders, verify these configuration points:
- Windows Firewall Blocking Ports: Mouse Without Borders communicates over TCP/UDP ports 15100 and 15101. In PowerToys, click the Firewall rules button to verify proper exception rules are active.
- Network Isolation: Ensure both computers are connected to the same local Wi-Fi subnet or Ethernet switch. Guest Wi-Fi networks feature client isolation that blocks inter-device communication.
- Lock Screen Security: By default, cursor crossing is disabled when a computer is locked. Enable Hide mouse at screen edge or Draw mouse cursor if pointer tracking is lost.
Configuring Mouse Without Borders in Microsoft PowerToys eliminates multi-device hardware clutter, uniting your Windows workstations into a single, cohesive multi-monitor productivity environment.