If your installation uses PCF, you can run PCF applications on ICSF. You can use an installation option to specify whether a PCF application runs on ICSF. If you are migrating from PCF, ICSF provides a conversion program that converts a PCF CKDS to ICSF format.
For example, most callable services in ICSF call an exit before and after processing. Such an exit can alter return codes in a service.
SVC 143 (0A8F) is an ICSF system SVC that is used by CUSP and PCF macros (GENKEY, RETKEY, CIPHER, and EMK) for SVC entry into ICSF. The SVC allows you to run a CUSP or PCF application on ICSF. See Running PCF and z/OS ICSF on the same system for more information about running CUSP and PCF applications on ICSF.