Use just one keyboard and mouse with all your computers using free 'Barrier' github software

If you have several computers+displays or notebooks on your desk, it is a nuisance to have to reach over to another mouse or touchpad or keyboard when you want to use it.

'Barrier' is an OS application (for Windows 64-bit and Mac OS X 10.10 Yosemite+ and Linux) which allows you to control other computers from one 'main' computer.

Once you install the software on your 'main' computer (can be Windows or Linux or Mac) as the 'server', when you move the mouse cursor to the screen edge, the cursor will appear on the other computer screen and anything you type will go to the other computer instead of your 'main' computer. You can configure multiple computers - here I just have a Lenovo IdeaPad 300 physically located to the left of my main desktop PC screen, so I have configured the server so that when I move the cursor to the left-hand edge of the screen, it moves over to the IdeaPad 300...

press the 'Configure Server' button to arrange

Setup on Windows is quite simple:

Main Windows computer

1. Google for 'barrier github' Releases page and download and install the latest version of Barrier.
2. Tick the Server checkbox as we want to use the mouse and keyboard connected to this PC to control the other computers.
   
   
   
   
   
3. Press F4 and untick the 'Enable SSL' box and click OK (also change the 'Screen name' to make more sense)

Set 'Screen name' and disable SSL

All other computers

Repeat above steps but tick the 'Client' checkbox and the 'Auto config'.

Make sure you also press F4 and disable SSL.

Note: If you require SSL, you can try enabling it but it may not work on all systems, so I recommend disabling SSL to start with and once it is working, you can try enabling it on all systems.

Usage

Use the 'Configure Server' button (on 'main' PC) to set the position of each of your 'slave' computers.

Now move the main computers mouse cursor to the main computers screen edge and it should appear on the adjacent computer's display.

You can follow a similar setup method for Linux-based or MAC OS X-based computers too.