# Example of ESB Invoking a CICS Transaction

This IVP example illustrates how a TIBCO messaging client application initiates a request message to start a CICS transaction task with the CICS transaction invoked method through Substation ES.

The CICS program replies by writing the reply information into the Substation ES trigger TDQ. Substation ES gets the trigger based on the defined search criteria for this trigger process and then delivers the reply and an acknowledgment to the IVP Sender Listener. In both directions, the Substation ES Transformer converts the data according to conversion rules in the recipe and trigger.

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