3.3 User Interface Traditional HTML-based Web interfaces are simple and tailored to the requirements of a certain BES. Since the communication paradigm is based on the stateless protocol HTTP, this kind of user interface supports only basic interaction facilities between client and server. Additionally, it lacks sophisticated integration mechanisms due to the common use of proprietary communication protocols and of application-specific look and feel. Our client-based framework overcomes these shortcomings by providing uniformity along two dimensions: Uniform look and feel of the user interface by encapsulating visualization components within an object-oriented framework implemented in Java. Each collection of BES representation at the client-side can reuse these framework components. Uniform accessibility of the user interface by providing a client-based message manager which handles different application protocols wrapped in messages.