6.5.5 Note on transmitting/receiving an event to/from earlier versions of event servers
The earlier versions of event servers (pre-Version 6 programs JP1/SES or JP1/AJS, and programs that use the JP1/SES protocol) are only able to receive events from IP addresses that are calculated using the network functionality (gethostbyname), which is managed by the OS.
When you transmit/receive events between an earlier version of the event server and JP1/Base, implement the event server on the host on the network that uses the IP address calculated with gethostbyname. (If you implement the earlier version of event server on another host, it can transmit events but cannot receive events.)