Multiregion operation

For CICS-to-CICS communication, CICS® provides an interregion communication facility that does not require the use of a network access method such as ACF/SNA or TCP/IP.

This form of communication is called multiregion operation (MRO). MRO can be used between CICS regions that reside:

In the same z/OS® image
In the same z/OS systems complex (sysplex).

Note: The external CICS interface (EXCI) uses a specialized form of MRO link to support communication between MVS™ batch programs and CICS.