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FilledSmallSquare $Notebooks is True if Mathematica is being used with a notebook-based front end.

FilledSmallSquare $Notebooks is automatically set by the front end when it starts the Mathematica kernel.

FilledSmallSquare See Section 2.14.5.

FilledSmallSquare See also: $FrontEnd, $Linked, $BatchInput.

FilledSmallSquare New in Version 2.