Valid on Alpha and Integrity server systems only.

    Generates a string that is suitable to be a file name and is
    guaranteed to be unique across the cluster. Unique file names can
    be useful when creating temporary files. (See CLOSE/DISPOSITION
    for an example.)

    The F$UNIQUE function has no arguments, but must be followed by a
    blank pair of parentheses.

    Format

      F$UNIQUE()