VMS Help DTM, SPAWN, Command Qualifiers, /NOTIFY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   /NOTIFY
   /NONOTIFY (D)

   Determines whether a message is sent to your terminal to notify
   you that your subprocess has been completed or aborted. You must
   specify the /NOWAIT qualifier with the /NOTIFY qualifier.