Indicate how to handle status changes for files for this region during CICS® region startup. To reduce region initialization time, CICS allows you to define a file that is not allocated and opened until the first time it is referenced. Instead, its state is left at closed/enabled until the file is referenced. Doing so 'spreads out' the overhead of opening many files during CICS initialization, resulting in a faster CICS region initialization process.
Specifying 'Yes' tells CICS BAC that during CICS region initialization, if it encounters a file whose last requested status was OPEN/ENABLED, it should allow the file to remain in the CLOSED/ENABLED state during startup processing.