Use your iPad as a wireless display, to extend your Mac desktop. Ever wish you had an extra display for your computer? There’s an app for that!
Turn your iPad, Android tablet, Kindle or smartphone into a high performance extra monitor for your computer
Multiplicity enables a user to control multiple computers with one keyboard and mouse.
Smart devices become monitors by connecting them to a PC via USB! The Convenient Connect TwomonUSB
This program will let you use two screens on two different computers as if they were connected to the same computer. It even works between different operating systems.