# Message Flow with Enterprise Message Service

Substation ES supports TIBCO Enterprise Message Service, which offers several message services, including Java Message Service (JMS), which in turn supports two messaging models.

The following list shows two messaging models:

- Queues (point to point)

  Messages are stored in a queue until they are processed.

- Topics (publish and subscribe)

  Messages are addressed to a topic.

An Enterprise Message Service server acts as an intermediary between TIBCO messaging applications and ESB Interface, as shown in the following figure:

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