So you want to use your iPad as an extra display to become more productive? The Duet Display app has you covered. It lets you use your iPhone or iPad as a secondary display for your Mac. Duet Display is pretty easy to use. Just download and open the app on your Mac and iOS device, connect your iDevice to your Mac, and you are set. The app runs on devices running iOS 5.1.1 or later. The below video shows the app in action:
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