Library /sys$common/syshlp/acledt.hlb PF4_KEY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    DEL ACE (PF4)

    Deletes the entire ACE in which the cursor is positioned and
    stores it in the delete-ACE buffer.

    UND ACE (GOLD-PF4)

    Inserts the contents of the delete-ACE buffer in front of the ACE
    in which the cursor is currently positioned.