# Configuration of Services

You have to configure some services before Substation ES™ can exchange data between systems that run in the z/OS environment and external TIBCO messaging applications.

Before you can pass data between an external TIBCO messaging application and a transaction processing application, you must establish communications and determine how data is transformed between these environments. Data is transformed by Substation ES Transformer (referred to as Transformer) that you configure through the transformer data configuration user interface (DCUI) panels.

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