subscript                                    (Assignable)

        Contains an array of numeric values representing the subscripts of a
        GET array element.  Each element of Get:subscript represents a
        dimension of the GET array.  For example:

        @ 1,1 GET aTestA[4]        // Get:subscript contains {4}
        @ 1,1 GET aTestB[3,6]      // Get:subscript contains {3,6}

        If the GET does not involve an array, Get:subscript contains NIL.