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The workflow queue is used by the workflow engine to keep track of various workflow threads in progress.  A thread will have at least one queue entry, but may have more than one.

A queue entry is created initially when the thread is created.  A new queue entry is created each time a process point of type Process, then Decision is encountered.

Each queue entry is uniquely numbered, and the queue number is written to the Work log and History log.  The work log uses the unique queue entry to decipher which responses go to which requests.