Unicast propagation uses TCP unicast communication, which is usually best for a small amount of registered clients. This is the default communication type.

The same as Unicast in terms of communication protocol, but uses a single client-side multiplexer, which handles all of the dispatching to the different notification listeners.

Multicast propagation uses UDP multicast communication, which is usually best for large amounts of registered clients. See the JavaSpaces Multicast Notifications section for configuration options.