The CICS® interregion communication (IRC) facility supports MRO through the use of DFHAPPL.applid profiles in the FACILITY class.
These security checks, via RACROUTE calls to the SAF interface, are always performed, regardless of whether the or not MRO partner regions are running with external security active for CICS resource security checking (that is, for both SEC=YES and SEC=NO). In order for an MRO connection to be established between two regions, both the logon and connect security checks in both systems must be completed successfully.