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A software KVM lets one keyboard and mouse control two or more computers by sending input events across their network connection. Move the pointer to a configured screen edge, press a switching shortcut, or use an explicit control, and the active target changes. Clipboard sharing is a separate feature that can copy data between those machines. This makes adjacent computers feel like one workspace, but it does not switch or merge their displays.
The right approach depends on your operating systems, supported hardware, switching style, clipboard needs, network, and security rules. The sections below explain the mechanism, setup patterns, product differences, and the risks to check before pairing computers.
What a software KVM actually does
Traditional KVM means keyboard, video, and mouse. A software KVM normally handles only the keyboard and mouse portions. An agent running on each participating computer sends keyboard and pointer events over the local network. One computer acts as the controller for the current interaction, while another receives the events as the selected target.
Because the software relays input rather than changing a monitor signal, each computer continues rendering its own desktop. You still need a display connected to each machine, or a remote-display arrangement, to see both systems. If your requirement is to press a button and send one monitor, keyboard, and mouse to different computers, you are looking for a hardware KVM or another display-switching system; the software options described here do not automatically provide that video function.
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How the pointer changes computers
In the common edge workflow, you arrange the virtual screens in the software. When the pointer reaches the configured edge of one computer’s desktop, it crosses into the neighboring computer and that machine becomes the input target. The handoff can feel like moving between monitors, even though the monitors remain connected to separate computers.
Many products also provide a keyboard shortcut or an on-screen, button-based switch. Those alternatives matter when an edge is hard to reach, when full-screen software captures the pointer, or when you want a deliberate change rather than an accidental crossing. Only one computer receives the keyboard and mouse at a time in the documented Synergy workflow; other products may expose additional modes.
What is transmitted
The input channel carries key presses, releases, pointer movement, and button clicks. The receiving computer processes those events as if they came from its locally attached devices. Network quality therefore affects responsiveness: both machines must be reachable on the same usable network path, and firewalls must allow the software’s peer connection.
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Clipboard sharing is a separate data path
Keyboard-and-mouse control does not automatically imply clipboard synchronization. When clipboard sharing is enabled, a copy operation on one computer can make clipboard content available to another, where you can paste it. The feature can be disabled independently in products that expose that control.
Do not assume clipboard behavior is identical across products. Some implementations support only text or selected clipboard formats; others transfer richer content. Logitech says its Flow feature can transfer text, images, and files. That statement applies to Flow and its supported devices, not to software KVMs generally. File-size limits, format handling, overwrite behavior, and whether a transfer is immediate or triggered by paste must be checked in the current documentation for the product you choose.
Why the distinction matters
Input sharing lets a computer receive your actions. Clipboard sharing can move the information you copied, including material that never appears in the active window. Treat the clipboard as an intentional data channel, not as a harmless convenience, especially when one machine belongs to an employer, a client, or another person.
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How the main approaches differ
All of the options below can make one keyboard and mouse useful across computers, but they solve different compatibility and control problems. Verify current operating-system requirements and releases before installing; those details change more often than the basic concept.
| Option | Documented capabilities | Important trade-off or check |
|---|---|---|
| Logitech Flow | Pointer movement switches computers; a Flow-supported keyboard can follow the mouse; copying and pasting can transfer text, images, and files. | Requires Logi Options+ on both computers, a Flow-supported mouse, and pairing the mouse to the computers on separate channels. The computers need a shared Wi-Fi or Ethernet network. Confirm that your exact mouse and keyboard are on the current supported-device list. |
| Synergy | Relays input directly between computers on a local network and documents an encrypted connection. Its FAQ says only one computer receives keyboard and mouse input at a time. Clipboard copy/paste security controls are available. | Compare the current version, license, operating-system support, discovery and configuration process, and clipboard controls. Settings and ports can differ by major version. |
| Microsoft PowerToys Mouse Without Borders | Microsoft documentation lists clipboard sharing and a mode that sends the same input to multiple machines. | It is oriented toward Windows. Verify the current Windows and PowerToys requirements and decide whether simultaneous input is useful or confusing for your workflow. |
| Input Leap | Project documentation describes SSL/TLS support and warns that a malicious client may receive input or potentially set clipboard contents. | It is a community project. Check the current release, platform compatibility, server/client configuration, and how you will authenticate trusted peers. |
There is no universal winner. A device-bound approach can be simpler when you already own compatible peripherals; a cross-platform software approach may be preferable when the computers run different systems. A separate question is whether you need video switching at all.
Typical setup: make two computers behave as one workspace
The labels differ by product, but the sequence is consistent. Perform these steps only on computers you are authorized to connect.
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- Confirm the topology. Decide which computer will be your primary controller and where each computer’s display sits relative to the others. Write down the operating system and whether either machine is managed by an employer or school.
- Check compatibility. Read the product’s current support page for operating systems, versions, supported keyboards or mice, and clipboard formats. For Flow, install Logi Options+ on both computers and confirm that the exact mouse is supported.
- Put the computers on a suitable network. Connect both to the same trusted Wi-Fi or Ethernet network. A guest network, client isolation, VPN policy, or firewall can prevent peer discovery even when both machines have internet access.
- Install the software on every participating computer. The controller and each target need their corresponding client or agent. Keep installations and updates within your organization’s software policy.
- Pair or authorize the peers. Use the product’s pairing code, key, or approval screen rather than accepting an unknown computer. Record which machine is the server/controller and which is the client/target.
- Arrange the virtual screens. Place the target to the left, right, above, or below the controller as your physical monitors are arranged. Set an edge, hotkey, or explicit switch and test that the pointer changes only when intended.
- Choose clipboard behavior separately. Enable synchronization only if the data path is allowed. If the software offers format, direction, or disable controls, set them before copying sensitive material.
- Test with harmless content. Move the pointer across each boundary, type in a text editor on each computer, and copy a short non-sensitive sentence. Confirm that the active machine changes and that clipboard behavior matches your expectation.
Flow-specific pairing pattern
For Flow, the documented setup requires Logi Options+ on both computers, a Flow-supported mouse paired to each computer on separate channels, and a shared Wi-Fi or Ethernet network. A supported keyboard can follow the mouse as the pointer moves between systems. A keyboard that is not on the supported list will not gain that behavior merely because the mouse is compatible.
When simultaneous input is appropriate
Mouse Without Borders documents a mode that sends the same input to multiple machines. That can help with repetitive, identical actions, but it is different from the usual one-target-at-a-time workflow. Use it only when you understand which applications will receive the keystrokes and how you will stop the mode.
Security and privacy checks before enabling sharing
A paired computer can receive keyboard and mouse events, and a synchronized clipboard can receive copied data. On a shared or managed network, local presence is not proof that a peer is trustworthy.
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- Pair only trusted machines. Verify the computer name, pairing code, certificate, or other identity mechanism. Remove old peers when a computer is retired or reassigned.
- Review encryption and authentication. Prefer a product and configuration that encrypt the input connection and authenticate the peer. Keep pairing secrets private.
- Limit network exposure. Use a trusted local network, apply host-firewall rules recommended by the vendor, and avoid exposing the service to the public internet.
- Decide whether clipboard sharing is permitted. Passwords, customer records, source code, and internal documents can cross the boundary. Follow your employer’s device and data-handling policy.
- Disable what you do not need. If you need pointer sharing but not clipboard transfer, turn off clipboard synchronization where the product permits it.
- Protect the endpoint. Keep the operating system and KVM software updated, lock both computers when you leave, and remember that an unlocked target can receive input even if its screen is not in front of you.
Synergy’s Business & Enterprise Hardening Guide states: “Clipboard sharing moves user data between machines and is the control most likely to matter at a data boundary.” The statement is a vendor security guideline, not a universal technical rule, but it captures why clipboard settings deserve a separate approval.
Version-specific Synergy details
Synergy’s October 3, 2026 security overview is scoped to Synergy 1 v1.21.4 and Synergy 3 v3.7.2. Its hardening guidance identifies port 24800 for keyboard and mouse input and port 24802 for Synergy 3 settings synchronization, not keyboard, mouse, or clipboard data. Treat those port assignments as version-specific: check the documentation for the release you actually run before changing firewall rules or quoting them in a security standard.
Input Leap’s trust warning
Input Leap’s documentation warns that a malicious client may receive input and potentially set clipboard contents. Configure a known server and validate the identity of clients; do not treat “on the same LAN” as an authentication method.
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The pointer will not cross the edge
- Confirm both agents are running and that the virtual screen arrangement matches the physical arrangement.
- Check that the computers can reach each other on the same network and that host firewalls are not blocking the peer connection.
- Temporarily test an explicit switch or hotkey. If that works, adjust the edge position or screen geometry rather than reinstalling everything.
- Exit full-screen applications that capture the pointer and retest from the normal desktop.
The keyboard types on the wrong computer
- Use the product’s visible status indicator or switch command to identify the current target.
- Check for a second sharing utility or remote-desktop session competing for input.
- If you enabled a simultaneous-input mode, turn it off and retest one target at a time.
Copy and paste does not work
- Confirm clipboard sharing is enabled on both sides; input sharing can work while clipboard transfer is disabled.
- Test plain text first, then check the product’s documented support for images or files. Do not infer rich-format support from a successful text paste.
- Review security policy, data-loss-prevention software, and endpoint controls that may intentionally block clipboard transfer.
- For large or sensitive files, use an approved transfer mechanism instead of assuming the clipboard is suitable.
Discovery or pairing fails
- Move both computers off an isolated guest network or disable client isolation on a network you administer.
- Verify that a VPN, split-tunnel rule, or firewall profile is not changing local-network reachability.
- Pair by the documented code or identity prompt, and remove stale pairings before trying again.
- Check the product’s current release notes and operating-system support; a recent update can change discovery or permissions.
Choosing between software sharing and a hardware KVM
Choose software sharing when each computer can keep its own display, the machines can communicate on a trusted network, and you value a pointer that moves between desktops or a shared clipboard. It is especially convenient for adjacent laptops or desktops where changing the physical cable every time would be disruptive.
Consider a hardware KVM when you must switch one monitor and its peripherals between computers, when network policy forbids input-sharing software, or when the computers cannot maintain a suitable network path. Hardware models vary by video connector, resolution, refresh rate, USB behavior, and operating-system interaction. The information here does not establish compatibility for any particular model, so match those display specifications separately.
A practical decision checklist
- Operating systems: Are all of your computers supported by the same product?
- Hardware: If choosing a device-linked option, are your exact mouse and keyboard listed as supported?
- Switching style: Do you prefer screen-edge movement, a hotkey, an explicit button, or simultaneous input?
- Clipboard scope: Do you need text only, or images and files as well? Can the feature be disabled independently?
- Network: Are the machines on a trusted, reachable Wi-Fi or Ethernet network without client isolation?
- Security: Can you authenticate peers, use encryption, apply firewall rules, and comply with organizational policy?
- Video: Do you actually need to switch a display signal? If yes, software KVM alone is not sufficient.
Once those questions are answered, install the least-privileged option that meets the workflow, test with non-sensitive data, and document which computers are paired and whether clipboard transfer is enabled.
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