VGUIDE: 4GL application platform for large distributed information systems

The Visual and General User Interface for Database Environments (VGUIDE) is an integrated environment for developing and running distributed information systems based on the client/server model. Its main features are: (1) fourth-generation language (4GL) for developing database applications that reduce system development costs. (2) a real-time control monitor that can be scaled from small systems to heavily loaded large systems, and (3) 4GL application programs that can be ported among multi-vendor machines and operating systems. First, we give a technical overview of VGUIDE for developing distributed information systems. This involves an integrated middleware environment, various client/server models, and flexible application control mechanisms. Next, the performance of VGUIDE is examined. then, actual examples with VGUIDE are explained. Also, the effectiveness of VGUIDE is discussed.