The ALTPRI privilege allows the user's process to:
Increase its own base priority
Set the base priority of a target process
Change the priority of its batch or print jobs
The base priority is increased by executing the Set Priority
($SETPRI) system service or the DCL command SET PROCESS/PRIORITY.
As a rule, this system service lets a process set its own base priority
or the base priority of another process. However, one process can
set the priority of a second process only if one of the following
conditions applies:
The process calling the $SETPRI system
service has the same UIC as the target process.
The calling process has process control privilege
(GROUP or WORLD) over the target process.
With ALTPRI, a process can create a detached process with
a priority higher than its own. It creates such a process by using
an optional argument to the Create Process ($CREPRC) system service
or to the DCL command RUN/PRIORITY.
ALTPRI also lets you adjust the scheduling priority of a job
($SNDJBC) to a value even greater than that established with the
system parameter MAXQUEPRI.
Do not grant this privilege widely; if unqualified users have
the unrestricted ability to set base priorities, fair and orderly
scheduling of processes for execution can easily be disrupted.
HP OpenVMS Guide to System Security
Security for the System Administrator
