VMS Help Sys Parameters, JOBCTLD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    System managers do not usually alter JOBCTLD; this word of debug
    flags is used in rolling upgrades of OpenVMS. If bit 0 is set,
    the queue manager does not start. The default is 0.

    This special parameter is used by Compaq and is subject to
    change. Do not change this parameter unless Compaq recommends
    that you do so.