VMS Help CMS, MODIFY, LIBRARY, Qualifiers, /LONG_VARIANT_NAMES  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Change the attribute of a CMS library to allow the use of long
    variant names. Use /NOLONG_VARIANT_NAMES to change the attribute
    to disallow the use of long variant names. If this qualifier is
    not specified the status of this attribute remains unchanged.