ActiveMQ implements 2 protocols to discover agents and broadcasts packets : multicast (default) and rendezvous.
It makes sense to use zeroconf as the name instead of rendezvous:
- to avoid confusion with Tibco RendezVous technology,
- because the RendezVous name is not longer used by Apple. Due to Trademark/Copyright issues, Apple has changed this name into Bonjour (http://en.wikipedia.org/wiki/Bonjour_(software)).
It implements the zeroconf protocol so it is more exact.