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IBM CICS and the Coupling Facility: Beyond the Basics by Kellie Mathis, Rich Jackson, Randy Frerking, Arndt Eade

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Shared temporary storage
Temporary storage (TS) is the primary CICS facility for storing data that must be available to multiple transactions. Data items in temporary storage are kept in temporary storage queues. The items can be retrieved by the originating task, or by any other task, by using the symbolic name assigned to the temporary storage queue.
Temporary storage resides in one of three places:
Locally in Memory referred to as TS main
Locally in a VSAM data set referred to as TS Auxiliary
Centrally within a CF list structure referred ...

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