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1、 客户端(Client)或称为用户端,是指与服务器相对应,为客户提供本地服务的程序。
2、除了一些只在本地运行的应用程序之外,一般安装在普通的客户机上,需要与服务端互相配合运行。
3、因特网发展以后,较常用的用户端包括了如万维网使用的网页浏览器,收寄电子邮件时的电子邮件客户端,以及即时通讯的客户端软件等。
4、对于这一类应用程序,需要网络中有相应的服务器和服务程序来提供相应的服务,如数据库服务,电子邮件服务等等,这样在客户机和服务器端,需要建立特定的通信连接,来保证应用程序的正常运行。
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