All the servers register themselves in the JNDI on startup. This allows servers to locate other servers. One reason is to refresh the reference data cache. The Sterling Selling and Fulfillment Foundation servers cache reference data records for speed and scalability. When a server modifies a reference data record, it notifies all the servers in the JNDI list to refresh their cache.
The agent server also uses the JNDI to look for the IBM® WebSphere® MQ message queue service.