Notes:
Another feature added later in the R&D process was the concept of Event Processing. Traditional M systems have no notion of event processing. It was recognized early in the project that objects needed the capability to be fully functional and to maintain integrity across related objects at runtime. For example, if a patient object is being displayed at the presentation layer and the underlying object is modified and the change becomes persistent, all other objects are out of sync at that time. A mechanism is needed to alert all objects that the change has been made so they can update themselves and their presentation.