# System Software Requirements

Before installing TIBCO Substation ES on a z/OS environment, install and properly configure the following TIBCO messaging software components. Substation ES supports either the TIBCO Rendezvous or TIBCO Enterprise Message Service messaging protocol. Refer to the appropriate product version release notes to see the supported versions of z/OS and also messaging release levels.

## TIBCO Rendezvous

If TIBCO Rendezvous is your choice for the Substation ES messaging protocol, Substation ES now provides a basic Rendezvous application set of daemon, publisher, and listener programs for activating Substation ES and communicating with other applications. Depending on the network configuration, a TIBCO Rendezvous daemon (`RVD` and `RVRD`) should be running on z/OS to enable communications with other messaging applications.

To use TIBCO Rendezvous outside the TIBCO Substation ES requirements, you must purchase the TIBCO Rendezvous for z/OS product. For the TIBCO Rendezvous version required for your installation, you can confirm with your account representative or TIBCO Support.

## TIBCO Enterprise Message Service

Before activating Substation ES, if TIBCO Enterprise Message Service is your messaging protocol, you must install TIBCO Enterprise Message Service server within your network.

For information about TIBCO Enterprise Message Service, see TIBCO Enterprise Message Service User’s Guide.

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