When you are desperate for screen space.

A while back I wrote about using the Air Display Mac application which permits use of the iPad as an external display. After adding my third Dell 2209WA monitor to my desktop rig, I revisited Air Display to see if it still functions, this time as a fourth monitor.

It does!

The iPad is being used as a fourth monitor.

Sure, cursor response on the iPad is a tad jerky as the cursor’s data stream is being sent over the air, but it’s more than acceptable as a peripheral for displaying a screen which rarely needs mouse action, like a live stock price chart, for example.

Here’s how I have System Preferences->Displays->Arrangement set up:

The rarely accessed screen is pushed out to the left.

Note that the blue screen area with the white menu bar is aligned at the base, not at the top – this makes sure straight lines remain straight, rather than stepped, as you mouse across. Also, by relegating the iPad display to the left or right you avoid having to access the jerky iPad screen’s base if that’s where you keep your application icons. I have mine set to hide except in the case of a mouseover, which is why they are not visible in the photograph above.