/sys$common/syshlp/helplib.hlb INSTALL, REPLACE, Qualifiers, /HEADER_RESIDENT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /HEADER_RESIDENT
       /NOHEADER_RESIDENT

    Installs the file as a known image with a permanently resident
    header (native mode images only). An image installed header
    resident is implicitly installed open.