当今社会已跨入信息化时代,多种形式的新型信息服务和信息处理系统的研究已成为热门课题。尤其是计算机网络技术的日趋成熟,使地理分散、不同种类的计算机在全球范围内的互联成为可能,推动了基于计算机网络的信息服务系统的发展。就向18世纪电话带来的那场 Nowadays, society has stepped into the era of informationization. Research on various forms of new information services and information processing systems has become a hot topic. In particular, the maturity of computer network technology makes it possible to disperse geographically and to interconnect different kinds of computers on a global scale, and to promote the development of information service systems based on computer networks. That brought to the 18th century phone