Occasionally, I would like to use my iPad (3rd gen, iOS7) as a second screen (an extension, NOT a mirror) for my Macbook Pro (Mountain Lion).
Is this possible without paying for an app in iOS7? Does Mavericks or iOS7 include any new related functionality? I am aware that there have been improvements for second displays in Mavericks.
See also: How to use the new iPad (3rd gen) as a second screen? and Is it possible to use an iPad as an additional computer monitor?