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

   /UPDATE[=(update-file-spec[,...])]

   Indicates the file or files containing the editing commands and
   changes to be applied to the input source file.   The default file
   type of these files is UPD.