VMS Help DCL Tips, String  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    A character string value is represented as a sequence of
    characters enclosed in quotation marks (" "). A quotation mark
    in a character string must be represented by two quotation marks.
    In certain contexts, the quotation marks are optional.

    For additional information on specifying character strings, see
    the OpenVMS User's Manual.