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Business Process Portal Administrator's Guide
Managing work item queues : Understanding work item queue management

Understanding work item queue management

In Business Process Server, workitems can be generated when a process instance is created, and these workitems are assigned to a valid human performer or valid user group as tasks. A work item queue is a dynamic data structure to which users and groups are added, allowing them to subscribe to workitems assigned to the queue. Work item queues are dynamic in the sense that, you can add, remove or update users and groups to a queue during run time.
Note: To enable work item management using queues, the Business Process Server property oebps.queues should be set to TRUE in oebps.conf file. For more information, see BP Server property files.
Important: If a task is assigned to any member of queue containing nested groups, then only the members of highest level group find the task in Available state.