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I just installed Mountain Lion and it has the new AirPlay Mirroring feature. Is there an option to extend the desktop, as you would with a second monitor, instead of mirroring?

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Mac OS X Mavericks now supports this feature out of the box. – Fabien Nov 10 '13 at 19:04
@Fabien - Can you add this as an answer? – 1.21 gigawatts Jun 8 '14 at 14:52

I've seen that AirParrot does it, but it's a little slower than the OS X integrated app.

Desktop Extension. Add more space to your desktop by creating a virtual monitor and extending your desktop to your TV. (OS X Only)

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Thanks Esteban. I clarified the question to say "is there an option" rather than "is there a way". – 1.21 gigawatts Jul 28 '12 at 7:37

Mac OS X Mavericks now supports this feature out of the box.

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