# Example of ESB Request – Reply DPL Container

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

The CICS application finds its input in a container with the same name as the program and replies by putting information into the container. 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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