NIS在主服务器上的一组称为映射的文件中存储有关用户、组、主机、地址和网络服务的信息。
NIS stores information on the master server in a set of files called maps about users, groups, hosts information, address, and network services information.
尽管个人地址簿模板不只是存储联系人和联系人组信息，但是本教程只关注该应用程序模板的这两个方面。
Although the personal address book template does more than simply store contact and contact group information, this tutorial focuses on these two aspects of the application template in this tutorial.
地址簿允许管理联系人信息和组邮件列表。
The address book lets you manage contact information and group mailing lists.
你可以发送信息给个别的用户，组或者IP地址范围，并且还可以把文档或者安装包作为附件。
You can send messages to individual users, groups or IP ranges, and also distribute documents or installation packages as attachments.
IP组播是面向组接收者的有效数据通信方式，利用一种协议将IP数据包从一个源传送到多个目的地，将信息的拷贝发送到一组地址，到达所有想要接收它的接收者处。
It's an efficient way to deliver IP data package from one source to more destination, send the copy of information to a group of address, to all the recipients at the same time.
所述方法为：服务端向客户端下发组播地址及客户信息列表；
The aforesaid method is as bellow: a server delivers a multicast address and a client information list to a client;
所述方法为：服务端向客户端下发组播地址及客户信息列表；
The aforesaid method is as bellow: a server delivers a multicast address and a client information list to a client;
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