It’s not uncommon for computer users to own a desktop PC and a laptop or a second PC used for testing. The problem with trying to operate multiple computers is each has its own display,. To make things easier, you can purchase hardware called a KVM switch (short for Keyboard, Video, Mouse). This allows you to operate a single keyboard, mouse, and a monitor across several computers by pressing a button to switch between them.

Another type of KVM switch is one that is entirely software based. This means no extra hardware is required and the switching is done automatically via an installed utility.

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A software KVM switch works through the local network so all the computers you want to control need to be connected to your LAN. The drawback is software KVM switches don’t have a option and only work for the keyboard and mouse. Just install the software on each computer and configure which one has the keyboard and mouse you want to use across devices. Then you have seamless movement between computers by off the edge of the desktop. Here are 4 free KVM switch programs that can be used to share your keyboard and mouse to control multiple PCs.

All have been tested on Windows 7 and Windows 10. ShareMouse ShareMouse has been around for several years, there are paid versions but also a freeware version that can be used non commercially.

The best features like remote lock/screensaver/shutdown, drag and drop, switching prevention, password protection and use on more than two computers are saved for the paid versions. A good thing about ShareMouse is you have the option of using a full installer or a portable version designed for USB flash drives. The installer is preferred if you have UAC enabled because ShareMouse can install as a service which helps get around permission issues. If you use the portable version and UAC is enabled, make sure to run the Sharemouse.exe as administrator. Once installed or running on two computers, Sharemouse will detect both computers and connect them together.

If no connection is being made, go to Settings > Network and click the “Find free port” buttons for both TCP and UDP, then try again. Advanced users can also use the Clients window to connect manually. When the computers are connected, enter the Monitor Manager and move the monitors around to suit your needs. They can be placed anywhere above, below or to either side. Most of the features are disabled in the free ShareMouse but there are a few options that do work and you can change. For instance, clipboard sync seems to work using copy and paste or Ctrl+V even though the website says it’s a paid feature.

Press Escape XX times to cancel remote control, quick jump hotkey, dim inactive monitors, scroll speed translation, and scroll direction can all be altered. You can use the free ShareMouse without issue for as long as you like.

If you enable one of the paid features (any setting labeled [Demo]) or connect more than two computers, the program enters Demo mode. This allows using the paid features for up to 30 minutes before ShareMouse pops up a message and disconnects. Then you have to restart the program on all connected computers to continue. Don’t use any demo features if you wish to avoid this. Input Director Input Director has been around since 2007 and is completely free and unrestricted for personal use. It is also compatible with Window XP up to Windows 10. On the face of it, Input Director looks more complicated to setup and use than the other software here, but in reality, it’s really not that difficult.