# Example of ESB Request – Reply Complex DPL

This IVP example, which works in the same manner as the CICS request or reply IVP, illustrates how a TIBCO messaging client application initiates a request message to invoke a CICS application by using the CICS DPL method through Substation ES.

The CICS application replies by putting information into the COMMAREA, from which the data is retrieved by Substation ES. Substation ES then 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. This example demonstrates most of the supported data type usages.

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