What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Software KVM apps let one keyboard and mouse control several nearby computers without moving cables. Each computer runs a compatible client or service, and the apps send keyboard, pointer, and (when supported) clipboard data across a network. You normally move the pointer across a configured screen edge to switch control; each computer continues rendering its own display.
That makes software KVM different from both a hardware KVM and remote-desktop software: it shares input rather than switching or streaming video. The right choice depends on your operating systems, network, clipboard needs, security requirements, and whether you can install software on every machine.
What a software KVM actually does
“KVM” means keyboard, video and mouse. A hardware KVM switches those physical signals between computers. A software KVM usually handles only the keyboard and mouse, with clipboard and file transfer as optional features. It does not normally send a computer’s screen to another computer.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →With a software KVM, you look at each machine’s own monitor. The application watches the pointer position on the computer with the physical keyboard and mouse. When the pointer reaches a configured edge, the application changes the destination and sends subsequent input events to another machine. Some applications also let you switch with a hotkey.
#1 Best Overall
- Powerful Turbo Fan:CAGIWIRU Electric Air Duster have reached speed up to 130000RPM,Can efficient remove dust and debris.With LED light and Three Adjustable Speed to meet with different cleaning tasks.
- With Attached USB C Fasting Charging cable.Charing 3 hours,Enjoy up to 240 minutes of use on the lowest setting, For third speed can use for 25mins.with four charging options to meet with your needs.
- Wide Application:Upgraded attached 5 different nozzles,making it suitable for a variety of scenes, such as car,pet, pc, keyboards, and other electronic devices. It also serves for office and home clean duster.
- Handy Design & Portable:Cordless air duster electric nozzle is Light weight and small size, design and comfortable to hold and space saving, convenient to carry around. You can put it in your room or inside the car without taking up space.
- Warranty & Support: Our Electric air duster comes with 5 years warranty and 24/7 customer service. During this period, if you have any questions,pls kindly feel free to contact us.
Server and client roles
Most products use a server-and-client model. The computer physically connected to the keyboard and mouse acts as the server. One or more client computers receive the events. The roles are logical, not necessarily tied to a particular operating system or hardware class; a laptop can be the server while a desktop is a client, or the arrangement can be reversed.
In the documented Synergy 1 architecture, the server captures keyboard and mouse events and sends them directly to clients over the network. Its default TCP port is 24800, and the vendor states that an inbound internet connection is not required. Newer Synergy 3 documentation describes a separate settings and discovery service; it says input and clipboard traffic do not use that settings connection.
What happens when you cross the screen edge
- The app maintains a software layout that describes which computer is to the left, right, above or below another.
- You move the pointer to the selected edge of the current computer’s screen.
- The server changes the active destination and forwards pointer movement, clicks, scrolling and keyboard events to that client.
- The client applies those events locally, so the pointer appears on its own attached display.
- Moving back across the corresponding edge, or pressing a configured shortcut, returns control to the previous computer.
The arrangement is virtual. It does not require the monitors to be the same size or resolution, but a poorly matched layout can make edge switching feel inconsistent. Set the virtual boundaries to match the physical positions of your monitors and test each corner.
What is shared—and what is not
Keyboard and mouse input
Supported applications can forward ordinary key presses, modifier keys, clicks, wheel movement and pointer motion. The receiving computer treats those events much like local input. Application-specific shortcuts, secure desktop prompts and games can behave differently, especially when they use exclusive or elevated input modes.
Clipboard data
Clipboard synchronization is a separate capability, not an automatic consequence of mouse sharing. Depending on the product, text and images may be supported, while rich formats, large binary objects or application-specific clipboard data may not be.
Rank #2
- Screen Cleaner is Your Screen’s New Bestfriend! - EVEO is proud to present a screen cleaner that’s perfectly suited for your TV. Meet your new screen cleaner, computer screen cleaner, laptop cleaner, iPad cleaner, Macbook,tv cleaner or any other electronic device. Our screen cleaner spray and wipe along with the included plush microfiber cloth, easily removes dust, fingerprints & other smudges on the screen’s surface. Clean effectively for a streak-free screen
- Gentle on your Screens - Our screen cleaner spray and wipes is compatible to be used even for the most sensitive LCD, LED, CRT, and OLED screens in proper use. Be at ease knowing that this product is compatible with all the major brands: LG, SONY, Samsung, Sharp, iPad, iPhone, Android screens, Kindle, PC monitors - we’ve got you covered! Can be used as LCD screen cleaner, tv cleaner, smart tv screen cleaner, and more
- Premium Super Soft Plush Microfiber Cloth - Included in this efficient screen cleaning kit. This screen cleaner spray and wipe has our signature plush microfiber cloth specially designed to comply with screens and monitors and leave them streak-free. Has been shown to effectively absorbs stubborn stains, zero streaks, and no fiber shedding. Always use this together with our screen cleaner for the best results
- Easy-to-Use Screen Cleaner Kit + microfiber cleaning cloth - The EVEO Screen Cleaning Kit will easily be your new favorite tool when it comes to taking care of the things you love most, quick and easy solution for a streak-free screen. Simply screw on the sprayer gun on the screen cleaner bottle. Spray the cleaning liquid onto the microfiber cloth, then wipe the screen until desired cleanliness & shine is achieved.
- Quality Screen Care Kit Worth Purchasing - Enjoy a convenient Screen Cleaner anytime, anywhere you need it. Your satisfaction is our top priority. We stand behind the quality of our products and that’s why, you shouldn’t be worrying at all. We manufacture the Best Screen Cleaner. and can be used for laptop cleaning kit, laptop screen cleaner, tv screen cleaner for smart tv. MacBook screen cleaner, monitor cleaner or screen cleaner spray for electronic devices with microfiber cleaning cloth
Microsoft’s current Mouse Without Borders documentation states that clipboard file copy and paste is limited to one file at a time and 100 MB. Folders and multiple files must be compressed into a zip file first. The same documentation identifies additional limits involving network files and full-screen Remote Desktop or virtual-machine scenarios. Treat those as product-specific rules rather than a universal software-KVM limit.
File transfer
Some applications expose file movement through clipboard commands, drag and drop, or both. ShareMouse documents clipboard sharing and drag-and-drop file transfer. Barrier documents clipboard support, but its project materials do not establish a common file-transfer limit. Confirm the supported file types and maximum sizes for the exact version you install.
Recommended Free Tools
Video
Software KVM apps generally do not transmit video. ShareMouse explicitly describes its product as a KVM without the “V,” and Synergy markets its software as a KVM without video. You must have a monitor connected to, or otherwise available for, each computer you want to use. If you need to view several machines through one display, use a separately evaluated hardware KVM or a remote-display solution instead.
How the computers communicate
Every participating computer must run a compatible application and be able to reach the others on a network. A wired Ethernet network and a Wi-Fi network can both work; reliability depends on local routing, firewall policy, wireless isolation and the application’s discovery method.
Authentication and discovery
Mouse Without Borders generates a security key on one computer. You enter that key and the host name on the other computer, then arrange the machines in the layout. This pairing step prevents an arbitrary nearby machine from being accepted solely because it is visible on the network.
Rank #3
- 【Large size】：Measuring 800 x 300 mm/ 31. 5×12 inches, which is wider and taller than others. Large mouse pad can perfectly fit your keyboard and mouse of any size, and there is also ample space for peripherals such as phones, tablets, etc.
- 【LED backlight mouse pad】：Blade Hawks RGB mouse pad provides 7 static modes and 7 dynamic modes will give you the options you are looking for. Power-off memory function remembers the last lighting mode you selected. The super glow fiber Chroma will give you a colorful gaming setup that you want.
- 【Anti-slip rubber base】：Made from Natural rubber, this gaming mousepad will firmly grip your desktop, allowing you to enjoy the ultimate precision in the games you are most passionate about. It also comes with a texture that enhances this ability even further.
- 【Smooth and waterproof surface】: Micro-textured cloth surface, for extremely precise mouse control and a smooth movement. When liquid splashes on the gaming mouse pad, it forms water droplets and slides down. Will not delay your work or gameplay.
- 【Plug and play】: This mouse and keyboard pad is powered by USB, plug and play, no driver required. One button control light modes. Press one time to change the lighting mode, press twice to change the brightness, press and hold about 3 seconds turn ON/OFF.
Other products may use a password, a generated key, manual host addresses, or automatic discovery. Barrier uses an explicit server/client configuration. ShareMouse documents password authorization as an option. Read the current setup screen carefully: a successful installation does not mean the peers are paired or that discovery is enabled.
Free tools Windows power users keep installed
One-click scans. No signup required.
Ports, firewalls and subnets
A firewall must allow the selected app’s traffic on the network profile you actually use. Synergy 1 documents TCP port 24800 as its default. Other releases or products can use different ports, and Synergy 3 has a separate settings/discovery path. Create the narrowest rule that works for your trusted local network rather than opening a service to every network or to the public internet.
Computers on different subnets may not discover one another automatically even when they can reach each other by address. In that case, use the product’s documented manual-connection method or adjust routing and firewall rules under your organization’s policy.
VPN and internet-only connections
A software KVM is designed primarily for nearby computers on a reachable local network. ShareMouse states that VPN software can route or cut local traffic and that it does not support internet-only operation. A VPN can therefore make a working local setup appear offline, or send discovery through an interface the app does not use. Disconnect the VPN temporarily for diagnosis, or configure split tunneling only if your security policy permits it.
Choosing among common software KVM options
Operating-system coverage and feature limits change with releases. Use the following comparison as a starting point, then verify the current documentation for your systems before deployment.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesRank #4
- 【Softer and More Comfortable】Vaydeer wrist rest has unique diamond pattern, which is the combination of softness and aesthetics. The materials of wrist rest are improved into higher quality memory foam and covered with silky smooth lycra. The computer wrist rest makes you as comfortable and cushiony as like rest your wrists on clouds.
- 【Ergonomic Wrist Saver】The wrist rests for keyboard and mouse comes with a 17.32×3.15×0.83 inch keyboard wrist pad and a 5.94×3.15×0.83 inch mouse wrist support. Based on ergonomic design, the unique concave shape is the perfect fit for your wrist joints. The wrist rest pad fits most computer keyboards and laptops, improve hand and wrist posture, release your wrist and arm stress.
- 【Non-Slip Rubber Bottom】Featuring an anti-skid silicone base on the bottom, this wrist keyboard support stays firmly in place on your desk, preventing the padding from sliding around, ensuring stable and consistent wrist support during extended computer sessions.
- 【Better Experience & Pain Relief】Our keyboard arm rest is beneficial to alleviate the soreness caused by direct contact and friction between your arm and a hard desk surface, reducing the risk of wrist fatigue or carpal tunnel. The soft texture of memory foam can evenly distribute the pressure around your wrists and provide good support with just enough give.
- 【Helpful in Multiple Scenarios】Whether you're working, studying, writing, typing, gaming, this keyboard and mouse rest combo is an essential accessory to add comfort and support to your hands and wrists. It’s also a great gift for men, women, family, friend, coworker, gamer, teacher, etc.
| Option | Documented platform scope | Clipboard and files | Distinctive details |
|---|---|---|---|
| Mouse Without Borders in PowerToys | Windows computers supported by Microsoft PowerToys | Clipboard sharing and file transfer; Microsoft documents one file at a time and a 100 MB limit, with folders or multiple files requiring a zip archive | Controls up to four computers; uses a security key and host name; service mode can reach elevated applications and the lock screen, with additional security risk |
| Synergy | Windows, macOS and Linux are marketed as supported | Copy and paste advertised; exact formats and limits depend on the release | Direct local-network architecture; Synergy 1 documents TCP 24800; Synergy 3 separates settings/discovery from input and clipboard traffic; the vendor identifies Deskflow as upstream |
| ShareMouse | Windows and macOS; the vendor says Linux is unsupported | Clipboard and drag-and-drop file transfer | Uses the local network; optional password authorization and AES encryption are documented; a demo is recommended for testing a particular configuration |
| Barrier | Project goals list Windows, macOS, Linux and FreeBSD | Clipboard sharing supported; file-transfer limits are not established in the cited project material | Open-source fork of Synergy 1.9 with server/client configuration, edge switching and a keypress option; check current maintenance and release status before relying on it |
Compare candidates on more than operating-system names. Check the maximum number of computers, whether all machines can run the same release, screen-layout controls, clipboard formats, file-size limits, authentication, encryption, firewall behavior and support for elevated or locked-screen contexts.
Step-by-step setup
The labels differ by product, but the sequence below applies to most software KVM deployments.
- List the participating computers. Record each operating system, version, monitor position, network connection and whether you have administrator rights to install services or change firewall rules.
- Select one application and verify compatibility. Install the same product family and a currently supported release on every computer. Do not assume that a server from one product can talk to a client from another.
- Connect the computers to a reachable network. Put them on the same trusted LAN where possible. Confirm that local-client isolation, guest-network restrictions and VPN policies will not block peer traffic.
- Install and assign roles. Designate the computer with the physical keyboard and mouse as the server or primary machine. Enable client mode on the others as the product requires.
- Pair or authenticate the peers. Enter the generated key, host name, password or manual address. Reject unknown connection requests and remove old pairings you no longer use.
- Allow narrowly scoped firewall traffic. Permit the application on the trusted private network. If you use a manual port, document it and avoid an internet-facing rule.
- Arrange the screens. Drag each computer into its physical left-right or top-bottom position. Save the layout, then test movement across every intended edge.
- Test basic input. Open a harmless text editor on each machine and verify letters, modifier keys, clicks, scrolling and the return path. Check that the pointer does not jump to an unintended edge.
- Test clipboard and files with non-sensitive material. Try plain text first, then a small image or file if supported. Confirm the receiving application, size limit and overwrite behavior.
- Document recovery. Know the local keyboard shortcut or mouse path that returns control to the server, and keep a spare input method available while changing network or service settings.
Security and privacy decisions
A software KVM can transmit everything you type while control is on another computer, including passwords, commands and messages. Clipboard synchronization can move copied credentials, tokens, documents and images. Use it only between computers and networks you are authorized to connect.
Network trust
Place the service on a trusted network profile and limit firewall scope to that profile. Avoid pairing over an unknown public network. If the computers belong to different people or departments, agree on ownership, logging and revocation before enabling shared input.
Encryption and authentication
Check the product’s current documentation for transport encryption, peer authentication and key management. Synergy’s security documentation says Synergy 1 sends input over a direct encrypted connection. ShareMouse documents optional password authorization and AES encryption. These are vendor descriptions of product controls, not evidence of an independent security certification or audit.
Best Value
- 【No Drill Mounted】Cable management tray can be assembled in as little as 3 minutes or less-simply. Side clips easily clampe the edge of desk, pass through the holes on the sides, and secure excess cables with baskets. Desk cable management supports inward or outward installation to meet your needs in different scenarios, and provides you with great convenience when collecting and organizing wires.
- 【Rubber Pad Protects Desk】Wire organizer under desk built-in soft rubber pads on the clamp protect your desk from scratches, so you will not damage your furniture or office.
- 【Sturdy and Beautiful】Cord management under desk is made of high-quality carbon steel and holds about 15 lbs. The wire basket has 2 holes on each side of the tray to enable your cables to pass freely. Cable baskets are suitable for desk thickness use from 0.4" to 2.4".
- 【Space Saving & Keep Organized】Desk cable management tray holds all your power cords, outlet strips, USB hubs and computer transformers hidden from your feet, and the data cables will not enter the vacuum cleaner to keep your desk clean and tidy. Desk wire organizer is also suitable for use in the kitchen and outdoors.
- 【Reduce Safety Risks】Cable tray under desk keeps all plugs away from your kids, no more worry about tripping. Using 2 holes wire tray saves extra space, helps you easily cabling and wire protection. The mesh design is not easy to accumulate dust, but avoids safety accidents caused by messy wires.
Elevated and lock-screen access
Mouse Without Borders can run as a service so it can control elevated applications or the lock screen. Microsoft warns that this mode introduces additional security risk. Enable it only when the workflow requires it, restrict who can pair, and disable it when you need the smaller privilege boundary of ordinary desktop control.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting by symptom
The computers cannot see each other
- Confirm that every machine is powered on, running the same product family and connected to a reachable network.
- Check host names, generated keys, passwords and manually entered addresses.
- Verify that the firewall permits the application on the private network and that guest Wi-Fi or client isolation is disabled where appropriate.
- Disconnect or reconfigure a VPN temporarily; it may be taking over local routes.
- If discovery fails across subnets, use the product’s documented manual-connection method instead of opening broad firewall access.
The pointer crosses, but keystrokes do not
- Test in a basic text editor to rule out an application that captures exclusive or elevated input.
- Check whether the client service is still running and whether the connection changed after sleep, network roaming or a lock-screen transition.
- Re-pair the client if its key or host identity changed.
Clipboard works for text but not files
- Check the product’s supported clipboard formats and file-size rules.
- For Mouse Without Borders, copy one file no larger than the documented 100 MB limit; compress folders or multiple files into one zip archive first.
- Try a local file rather than a network-mounted file, and avoid testing first inside full-screen Remote Desktop or a virtual machine.
- Use a separate approved file-transfer method when the data is sensitive or the KVM’s transfer behavior is unclear.
The pointer is hard to recover
Use the configured switch key or move back through the edge that leads to the server. If the layout is wrong, open the app’s arrangement screen locally on the server and correct the monitor boundaries. Keeping a spare mouse or keyboard connected during reconfiguration prevents a layout error from becoming a lockout.
Software KVM versus hardware KVM and remote desktop
| Requirement | Software KVM | Hardware KVM | Remote desktop |
|---|---|---|---|
| One keyboard and mouse for several computers | Yes, when every computer can run the app and reach the network | Yes, through physical switching | Usually, but through a remote session |
| View a computer without its own monitor | Normally no; video is not transmitted | Yes, if the KVM switches the required video standard | Yes, by streaming the remote display |
| Install software on every computer | Required | Not required on the computers | Usually required on, or enabled by, the host |
| Clipboard and file movement | Optional and product-specific | Depends on the hardware design; USB switching is not the same as clipboard synchronization | Depends on the remote-desktop product and policy |
| Works when machines are isolated from the network | No | Yes, if connected physically | No |
Choose software when the computers are nearby, you can install and manage the app on each one, and you want seamless pointer movement while viewing each local display. Choose hardware when software installation is impossible or video switching is essential. Choose remote desktop when you need to operate a machine without using its own monitor or when the computers are not in the same physical workspace.
Practical limits to plan for
- Mixed environments: A product may support Windows and macOS but not Linux, or may support different features on each operating system.
- Updates: Version, licensing, platform support and network-security details change. Recheck the vendor documentation before a new deployment or operating-system upgrade.
- Sleep and roaming: Wireless roaming, sleep, hibernation and network changes can interrupt discovery or leave a stale client connection.
- Secure prompts: Operating-system elevation dialogs and lock screens may be intentionally inaccessible without a service or equivalent privileged mode.
- Data sensitivity: Clipboard convenience can become accidental disclosure. Clear the clipboard after moving sensitive material and do not pair computers you do not control.
- Maintenance: Open-source projects and commercial products can differ in release cadence and support. Verify that a project is actively maintained before standardizing on it.
Decision checklist
- Can the chosen app run on every computer and operating-system version?
- Are all computers on a network that permits the required peer traffic?
- Do you need only text, or also images and file transfer?
- Will the documented clipboard limits cover your files?
- Do you need elevated-application or lock-screen control, and can you accept the extra risk?
- Are the local monitors available, or do you actually need video switching?
- Have you tested the exact network, VPN, firewall and virtual-machine combination?
For the common case—two or more nearby computers with their own monitors—the core mechanism is straightforward: one app captures input, sends it over an authenticated local connection, and changes the destination when the pointer crosses a virtual edge. Clipboard and file sharing add convenience but require their own compatibility and security checks. If you need video, cannot install software, or cannot establish a trusted network path, a software KVM is the wrong category of solution.
Frequently Asked Questions
Can a software KVM work with computers on different Wi-Fi networks?
Only if the networks provide a reachable, permitted route between the machines and the application supports that arrangement. Automatic discovery often fails across subnets, and VPNs can interfere with local traffic. Follow the product’s manual-connection and firewall guidance rather than exposing the service to the public internet.
Why does the cursor move to another computer but the secure login screen does not respond?
Many operating systems isolate lock screens and elevated prompts from ordinary desktop input. A product’s privileged service mode may support those contexts, but enabling it expands access and should be treated as a separate security decision.
Do both computers need the same monitor resolution?
No. The app uses a virtual layout, so different resolutions can work. Align the software boundaries with the physical monitor positions and test each edge, because mismatched sizes can make the crossing point feel unintuitive.
Is clipboard synchronization safe for passwords and authentication codes?
It moves copied content to another computer, so treat it as sensitive data in transit and at rest. Use only trusted, authorized machines, verify the product’s authentication and encryption controls, and clear the clipboard after handling secrets.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
