Gateway component model
by a hierarchy of containers
WebFlow server hosts users and services
Each user maintains a number of applications composed of custom modules and common services
Components are software objects that provide implementations of a set of standard behaviors. These behaviors are defined by the component framework to ensure that components can be composed and interoperate efficiently and without conflict. Juan Villacis et al., “CAT: High Performance, Distributed Component Architecture…” GATEWAY: BeanContextChild + custom (CORBA3-like) event model