Programs that are more sophisticated might use operating system signals and Simple Network Management Protocol (SNMP) to manage availability.
更复杂的程序可能使用操作系统信号和简单网络管理协议（Simple Network Management Protocol，SNMP）管理可用性。
Electronic mail system (EMS) is envisioned to work in a computer network for message forwarding, receipt and management, it is a sophisticated communication facility in office automation.
电子信件邮递系统(ems)是工作在计算机网络上的信息发送、接收和管理系统，是办公室自动化系统中的先进通讯手段。
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