A project from the Microsoft Garage, Mouse Without Borders allows you to share a mouse, keyboard, clipboard and even drag and drop files between up to four Windows PCs. This is the solution if you set up your notebook next to your desktop and want to be productive on both machines. There is a similar freeware tool that works across OSes, Synergy, but if you are only using Windows, Mouse Without Borders is a quick-and-dirty solution.
https://blogs.technet.com/b/next/archive/2011/09/09/microsoft-garage-download-mouse-without-borders.aspx
♦ Via Lifehacker.