You can set up this field interactively from the Job Queue Processes field. The default value is 0. If set to another value, this process will only handle job queue entries when the value in the Priority field is higher than or equal to this value.
If the value in this field and the value in the Maximum Job Queue Priority field are the same, the process will handle only jobs with this exact priority (as set up in the Job Queue Entry table, in the Priority field). In this way, it is possible for you to fine-tune where jobs are run.