CICS® function shipping enables CICS application programs to use EXEC CICS commands to:
An illustration of a shipped file control request is given in Figure 2. In this figure, a transaction running in a CICS system, CICA, issues a file control READ command against a file called NAMES. From the resource definition table, CICA discovers that this file is owned by a remote CICS system called CICB. CICA changes the READ request into a suitable transmission format, and then ships it to CICB for execution.
In CICB, the request is passed to a special transaction known as the mirror transaction. The mirror transaction recreates the original request, issues it on CICB, and returns the acquired data to CICA.