CICSPlex® SM provides an interface to an external security manager (ESM), which can be user-supplied or can be Resource Access Control Facility (RACF®).
Be aware that upon return from any user-supplied program, CICSPlex SM must always receive control in primary-space translation mode, with the original contents of all access registers restored, and with all general-purpose registers restored (except for those which provide return codes or linkage information). For information about translation modes, refer to the IBM ESA/390 Principles of Operation manual.