/sys$common/syshlp/helplib.hlb
CMS, INSERT, ELEMENT, Qualifiers, /IF_ABSENT

 *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Directs CMS to insert the element only if the group does not
    already contain that element. If the element already belongs to
    the group, CMS takes no action and does not return an error.
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