The client - layer communicate with server by the session - protocol and express - protocol which is worked out by us . distributed count is adopted in servers . every server deal with function - module itself and we use catalog - architecture to ensure data - consistent 多服务器之间将实现分布式计算，各个服务器负责自己的功能模块的计算，将使用目录结构保证数据的一致性，采用目录服务器使得客户机对服务器的访问是透明的。
