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FilledSmallSquare$TopDirectory gives the top-level directory in which Mathematica system files are installed.

FilledSmallSquare$TopDirectory returns the full name of the directory as a string.

FilledSmallSquare After installation on a hard disk typical values are:

FilledSmallSquare See The Mathematica Book: Section 2.11.4.

FilledSmallSquare See also: $LaunchDirectory, $InitialDirectory, $HomeDirectory.