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FilledSmallSquareEnvironment["var"] gives the value of an operating system environment variable.

FilledSmallSquare The values of environment variables are returned by Environment as strings.

FilledSmallSquareEnvironment returns $Failed if it cannot find a value for the operating system variable you requested.

FilledSmallSquare The behavior of Environment depends on the computer system you are using.

FilledSmallSquare See The Mathematica Book: Section 2.13.5.

FilledSmallSquare See also: Run, $CommandLine, $System.