Excluded Tasks
Use this form to prevent similar tasks from running simultaneously. If any tasks selected to be excluded are on the Active Background Tasks list with a status of READY or RUNNING, the task for which you have defined these excluded tasks cannot be added to the queue.
For example, if you have multiple versions of the APS EXE task, you probably do not want to allow APS EXE to run if any of the others are already running.
From the Background Task Definitions form, select a task and then click to display this form and define other tasks that will prevent it from running.