Current status of the mutually exclusive request being used by a task instance.

The Controller uses the same process each time it launches a task with mutually exclusive requirements and goes through the same series of states:

1	INITIAL	The initial state. This is the default value at launch time.
2	REQUESTED	When the task requests its mutually exclusive requirements, the Exclusive state becomes Requested.
3	ACQUIRED	When all of the requested mutually exclusive requirements are met and acquired by the server, the Exclusive state becomes Acquired.
4	RETURNED	When the task completes, the server returns the acquired mutually exclusive requirements and the Exclusive state becomes Returned.
5	CLEARED	When the Clear Exclusive command is run, the server cancels or returns the mutually exclusive requirements and the Exclusive state becomes Cleared.

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