系统主机，可视对讲系统是一套现代化的小康住宅服务措施，提供访客与住户之间双向可视通话，达到图像、语音双重识别从而增加安全可靠性，同时节省大量的时间，提高了工作效率。
如果主系统主机发生错误，虚拟ip地址就切换到备用机上。
In the event of a failure on the primary host, this virtual IP address fails over to the standby.
定期清理保养系统主机、打印机、显示器、鼠标、键盘，并处理系统常见故障。
Provide regular maintenance and service for the central processing unit, the printer, the display, the mouse, and the keyboard. Deal with the usual troubles in the computer system.
用户直接从自己的计算机拨号接入公告版系统的主机。
Subscribers dial directly from their computers into the BBS host computer.
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