For CICS-to-CICS communication, CICS provides aninterregion communicationfacility that is independent of SNA access methods.This form of communication is calledmultiregion operation(MRO). MRO can be used between CICS systems that reside:

  • In the same host operating system
  • In the same MVS systems complex (sysplex).

CICS Transaction Server for z/OS® can use MRO to communicate with:

  • Other CICS Transaction Server for z/OS systems
  • CICS Transaction Server for OS/390® systems

Note: The external CICS interface (EXCI) uses a specialized form of MRO link to support:

  • Communication between MVS batch programs and CICS
  • DCE remote procedure calls to CICS programs.

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