No idea... but this is what I got in "Project Management User Guide"
Task Priority Field
If the Priority field for a task in HP Project Management is set to greater than1,000, when the work plan information is sent to Microsoft Project, the priorityis set to 1,000. Neither HP Project Management nor Microsoft Project allow atask priority to be greater than 1,000.
Cheers.. Utkarsh Mishra
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me not be sure either ;-), however, I did find the following in the Solutions Integration Guide as well as in the System Admin Guide (page 218):
determines the priority of scheduled tasks. Because scheduled tasks run in the background, it may be useful to run these tasks at a lower priority than the threads servicing user-oriented interactive tasks."
Thus, might be there to determine the priority of the user-based tasks in respect to the scheduled ones to be executed.