What does the column "Priority" in the database table DWTasks mean?

The remaining entries in the DWTasks table are equipped with different priorities.
Criteria for this includes the column "Task_Type"
For example, in a reindexing process (Task_Type = 5) the priority is provided with "1".
The priority determines the order in which the entries are processed:
0   = Highest Priority
16 = Middle priority
99 = Lowest priority