If you own an iPad, you're halfway to having a second screen for your laptop or desktop computer. The other half of the equation is to get a screen extension app, such as MaxiVista (Windows) or Air Display (Mac or Windows). Both cost $10, and both work the same way: You download the app onto your iPad, then download a small piece of software onto your computer. Once you install the computer software, the two machines establish a link over your Wi-Fi network or create a direct ad-hoc link between your tablet and computer. The connection is far more sluggish than a plugged-in screen—and a bad Wi-Fi connection makes things worse—but it turns your iPad into a perfect, movable clipboard.
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