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1 综述 MHS和远程会议系统日益变成我们日常工作中的标准通信工具。它们通常设计成集中式系统。该系统要求用户对系统的访问要通过终端线路或公用网并且共享存贮消息的公用数据库。这种形式的MHS的例子是瑞典的COM和Porta-COM系统(都柏林的EuroCOM是同样的系统)以及类似于GeoMail的Telebox那样的各种公用和专用邮箱系统。特别是具有会议功能的邮政系统很容易用这种方法实现。然而,将来更重要的而且由标准(X.400,
1 Overview MHS and teleconferencing systems are increasingly becoming standard communication tools in our daily work. They are often designed as a centralized system. The system requires that users access the system through terminal lines or public networks and share a common database of stored messages. Examples of this type of MHS are the COM and Porta-COM systems in Sweden (EuroCOM in Dublin is the same system) and various public and private mailbox systems like Telebox in GeoMail. In particular, the postal system with conferencing capabilities can be easily implemented in this way. However, more important in the future and by the standard (X.400,