memory at least a first cache for storing a set of one or more rules, each rule to trigger the transmission of a message to trigger an event in another one of {HEAD ~ the caches} in {TAIL ~ response} to receipt of a message from the application associated with the first cache, 
memory at least a first cache for storing a set of one or more rules , each rule to trigger the transmission of a message to trigger an event in another one of { HEAD ~ the caches } in { TAIL ~ response } to receipt of a message from the application associated with the first cache ,
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