Multiregion operation (MRO)

CICS® multiregion operation (MRO) enables CICS regions that are running in the same MVS™ image, or in the same MVS sysplex, to communicate with each other. MRO does not support communication between a CICS system and a non-CICS system such as IMS.1

ACF/Communications Server and SNA networking facilities are not required for MRO. The support within CICS that enables region-to-region communication is called interregion communication

The facilities provided by MRO include:
  • Transaction routing
  • Distributed transaction processing
  • Function shipping
  • Asynchronous processing
  • Distributed program link.
For more information about the design and implementation of interregion communication facilities, see Interregion communication (IRC). For descriptions of the facilities provided by MRO, see:
1 The external CICS interface (EXCI) uses a specialized form of MRO link to support communication between MVS batch programs and CICS.