近年来,随着计算机应用发展,许多新型的计算机体系不断问世,如“分布式计算环境”(Distributed Computing Environment)、“客户机/服务器”(Client/Server)等理论和技术的推出似乎都在向大型计算机主机的市场地位发出挑战。由于大型计算机的设计特点是集中式处理,因而人们在实时性处理速度上以及系统的高可靠性上,提出愈来愈高的要求,而分布式计算处理技术在某些应用方面确实优于 In recent years, with the development of computer applications, many new computer systems are emerging. The introduction of theories and technologies such as Distributed Computing Environment and Client / Server seems to be at Challenge the market position of mainframe computers. As the design features of large-scale computers are centralized processing, people are demanding higher and higher reliability in terms of real-time processing speed, and distributed computing processing techniques are indeed superior to those in some applications