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Re:Use your iDevice as an extra display for your Mac by cmelbye on Monday December 15, 2014 @04:55PM (#8754689)
Yeah, that statement is purely false. AirDisplay[1] does pretty much the same thing and has been out for years.

[1]: https://avatron.com/applications/air-display/

Re:Use your iDevice as an extra display for your Mac by memeplex on Tuesday December 16, 2014 @03:22AM (#8756286)
the commenter misquoted, the rest of the sentence is "... iDevice as an extra display for your Mac using the Lightning or 30-pin cable."