A.5 library(broadcast): Broadcast and receive event notifications
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Availability::- use_module(library(broadcast)).(can be autoloaded)
Sourcebroadcast_request(+Term)
Unlike broadcast/1, this predicate stops if an associated goal succeeds. Backtracking causes it to try other listeners. A broadcast request is used to fetch information without knowing the identity of the agent providing it. C.f. ``Is there someone who knows the age of John?'' could be asked using 
        ...,
        broadcast_request(age_of('John', Age)),

If there is an agent (listener) that registered an `age-of' service and knows about the age of `John' this question will be answered.