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 response to receipt of a message from the application associated with {TAIL ~ 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 response to receipt of a message from the application associated with { TAIL ~ the first cache } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH