# Components

Substation ES CICS Interface components interact with Substation ES servers in the CICS region.

Substation ES CICS Interface takes advantage of three Substation ES servers in the CICS region:

- SS Dynamic Applications Server

  The SS Dynamic Applications server primarily extends a CICS transaction request, allowing access to other CICS resources and transactions that cannot be DPL-enabled. A request can initiate a CICS program or transaction or write the formatted data buffer content to a TDQ. You can trigger those tasks by selecting the appropriate MOI option in the transformation configuration panels. The COMMAREA can be sent to programs or transactions.

  Note: Because they are performed asynchronously, all requests performed by the SS Dynamic Applications Server return only the results of the CICS function and not the result set from the application.
- SS Trigger Server

  The SS Trigger server primarily waits for events to be written to a CICS TDQ and signals Substation ES CICS Interface to extract them from the queue. CICS Interface then forwards the events or requests to ESB interface, where the data is translated according to the ESB Interface configuration. The data is published by Substation ES as a Rendezvous or Enterprise Message Service message. The name of the TDQ associated with this trigger server is specified in the CICS members of the system initialization parameters.

  The trigger server handles reliable and guaranteed triggers as well as CICS-initiated requests or replies. Each trigger facility can be disabled if it is not required by the Substation ES implementation.

- SS Administrative Server

  The SS Administrative server primarily performs housekeeping tasks and responds to Substation ES operational requests.

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