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FilledSmallSquare $InstallationDirectory gives the top-level directory in which your Mathematica installation resides.

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

FilledSmallSquare Typical values are:

FilledSmallSquare See Section 2.12.4.

FilledSmallSquare See also: $BaseDirectory, $HomeDirectory, $InitialDirectory, $InstallationDate.

FilledSmallSquare New in Version 5.0.