# Example of ESB Request – Reply DPL

This IVP example illustrates how a TIBCO messaging client application initiates a request message to invoke a CICS application with the CICS DPL method through Substation ES.

The CICS application replies by putting information into the COMMAREA; the data in this area is picked up by Substation ES. The server delivers the reply to the IVP Sender Listener. In both directions, the Substation ES Transformer converts the data according to conversion rules in the recipe.

For more information about the process flow, see the "Messages Flow" section of the TIBCO Substation ES Concepts manual.

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