Carsten, Either I misunderstood your answer, or you may have missed the fact that I was searching for _Consumer_ (not Producer) information that must be stored per-entity-per-user. Mike's concern about the OO-way of thinking - in which the basis is a per-entity-per-user references - is that the Consumer will have too many of these references. What I was trying to say in this email is that the Consumer _must_ have information that is per-entity-per-user _anyway_: because of the way actions work, and for stateless producer services, the Consumer must at least store the last action of the producer service. Gil