Description: Contains the printer assigned job identification for the job currently being processed by the processing PDL sub- system. The job ID is a monotonically increasing number. The job ID may be reset to zero at power-up and may roll over to zero after reaching some maximum value. Additional information: A value of -1 is returned when the printer is not parsing a job. When data for a new job is detected, this object is updated (the job may or may not turn out to be a Null Job); however, the trap does not occur until the printer determines that it is not a Null Job. (A job is considered to be a 'null job' if it has no name or job attribute, causes no pages to be printed, and consumes MIN_JOB_SIZE (9) or fewer bytes.) A trapped value will differ from the previous value by one or more. See the Job Boundary ERS for details on what constitutes a job boundary. Some job-info- objects are created when the first data bytes are received. If the printer determines that the job is a Null Job, the job-info- objects related to the Null Job are deleted. OZ retains the job-info- objects for the MAX_JOBS_IN_LIST (32) most recent jobs that are not Null Jobs. The first job received after power-up will have job ID 1, and the job ID will increment to 2,147,483,647 before rolling to zero. To distinguish whether a power cycle or a rollover causes a reduction in the job ID value, the object prtGeneralConfigChanges can be watched and if it increments at the same time as the drop is observed in the value of CURRENT-JOB-PARSING-ID, then a power cycle is the most likely cause.