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

       /PRIORITY=n

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

    Specifies the job scheduling priority for the specified job. The
    value of n is an integer from 0 to 255, where 0 is the lowest
    priority and 255 is the highest.

    The default value for the /PRIORITY qualifier is the value of
    the system parameter DEFQUEPRI. No privilege is needed to set the
    priority lower than the MAXQUEPRI value.

    The /PRIORITY qualifier has no effect on the process priority.
    The queue establishes the process priority.