Presence server: a "Presence server" provides the services to collect, manage and distribute the real time availability and the means for communicating among users.
在线状态服务器：“在线状态服务器”提供用于收集、管理和分发实时可用性和用户间的通信方法的服务。
Pay attention to system expandable capability increasing new applications and new functions, system process function expandability and system real time availability.
要注重系统增加新应用、新功能的扩展能力； 注重系统处理能力的可扩展性以及系统实时可用性。
Basically there are two different approaches to monitor applications' availability and response time, one is real end user transactions monitoring, and the other is proactive monitoring.
基本上，有两种不同的方法可以监视应用程序的可用性和响应时间，第一种方法是对真实的最终用户的事务进行监视，另一种是主动监视。
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