In a nutshell, it allows you to reach across your PC's as if they were part of one single desktop. I have two PCs on my desk at work connected to 3 LCD screens and using Mouse Without Borders I can move my mouse between the 3 screens, even though one of them is attached to a different PC from the other two. What’s more, I can move files between the 2 computers simply by dragging them from one desktop to another. In fact you can control up to four computers from a single mouse and keyboard with no extra hardware needed – it’s all software magic, developed by Truong Do who by day is a developed for Microsoft Dynamics. The software is easy to setup and in addition to enabling drag and drop of files, you can lock or log in to all PCs from one PC, and as a whimsical bonus is it allows you to customize your Windows logo screen with the daily image from Bing or a local collection of pictures I regularly use it to have one PC dedicated to social media streams while I work away on my other PC connected to two screens.
Read more and download the software for free here