Certain ICSF processes read records from or write records to the CKDS. These processes include running a conversion program, refreshing and reenciphering the CKDS, and using the key entry hardware to enter a key. When these processes read or write CKDS records, they call the exit. You can customize the processing of a CKDS record read-write with the single-record, read-write exit (CSFSRRW). See Single-record, Read-write installation exit for more information about the single-record, read-write exit.

When application programs write records to or read records from the PKDS, ICSF calls the single-record, read-write exit.