This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)

$Linked$CommandLine

$Notebooks

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 The Mathematica Book: Section 2.13.5.

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

$Linked$CommandLine