The participating entities are:

• View: Represents the visible component the user interacts with. This will typically be a swing component. View components should not be shared.
• Controller: The controller has the responsibility of handling userinput and processing the events into model updates. Controller components should not be shared. It is the controllers responsibility to ensure that each user event will result in only one model update event.
• Processor: To be able to change controller processing, the controller delegates model change processing to it's associated processor. The processor is of the type DataEntityProcessor. DataEntityProcessor objects are compositions and can therefore be extended with any extra functionality needed. Each controller has one root processor which can have any number of subprocessors. Processors are stateless and should be shared.
• UI Bean: Logical structure containing a view and it's bindings to the model. An GUI bean always contains a view. If the view should reflect data contained in the model, it also will contain a model listener which processes model updates into view changes. If the bean provides functionality for modifying the model a controller will handle this.
• Model: The common point of interaction for the UI system is the shared model, which contains all all data need to be exchange between the participating components. The model notifies all model listeners each time a model change occurs. The model is the only state in the UI component which is shared.