OPENING AND CLOSING OF FILES - IBM Mainframe

When an application program accesses a file, the file must be open under CICS. Files used by CICS are usually opened during the start-up time. CICS files must be closed if they need to be changed by a batch program since they cannot be updated by both CICS and the batch system at the same time. If the file is closed you can open the file using the Master Terminal Transaction (CEMT) before you initiate an application program.


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