Can Apple TV extend screen instead of mirror?

As spec, Apple TV able to mirror display.
Intend to extend Macbook Air display to a HDMI TV via wireless.

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    Mountain Lion or below: No
    Mavericks: Yes

    On Mavericks, you'll find a menu item "Use Airplay Display To" with two choices: "Mirror Built-in Display" and "Extend Desktop". This feature is new to Mavericks. It is not available for Mountain Lion or earlier.

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