VMS Help STOP, /QUEUE, /REQUEUE, Qualifiers, /PRIORITY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /PRIORITY=n

    Requires OPER (operator) or ALTPRI (alter privilege) privilege to
    raise the priority value above the value of the system parameter
    MAXQUEPRI.

    Changes the priority of the requeued job or jobs. The parameter
    n can be from 0 to 255; the default value of the n parameter is
    the same as the priority value that the job or jobs had when they
    were stopped.

    Generally, the /PRIORITY qualifier is used to lower the priority
    of a job or jobs, which ensures that the job or jobs runs when
    the queue contains no other jobs. No privilege is needed to set
    the priority lower than the MAXQUEPRI value.