# For Rendezvous

Substation ES currently supports the reliable service level for message communication to Rendezvous applications.

You can specify the usage and implementation of the reliable service level in the Substation ES configuration, which is coordinated by Substation ES and adhered to by Substation ES Interface.

For the reliable service level, Substation ES receives a message and forwards a request to the appropriate Substation ES interface for execution of a transaction. If necessary, a receipt of the delivery, execution status, and the output result set can be returned to the TIBCO messaging applications. The execution path of this service level within Substation ES is lightweight and can be used by many applications to submit inquiries or supply information.

Note: No context information is stored, so if a network loss occurs or if the applications on z/OS fail to respond, no results are returned to the TIBCO messaging applications. However, informative error notifications together with a correlation tag are sent to processes expecting a reply.
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