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based on an earlier version of the Wolfram Language.
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[an error occurred while processing this directive] $Notebooks

  • $Notebooks is True if Mathematica is being used with a notebook-based front end.
  • $Notebooks is automatically set by the front end when it starts the Mathematica kernel.
  • See the Mathematica book: Section 2.13.5.
  • See also: $FrontEnd, $Linked, $BatchInput.