如果你只是直接点它，就会有一个窗口跳出来，提示你输入用户名。
If you don't have anything selected it opens a window to enter the username.
用户用这些链接点来创建当前项目中的需求和外部项目需求之间的链接点。
These connections are required for users to create traceability between requirements in the current project and requirements in the external projects.
用户可以访问一个网页，也可以从某个FTP网站下载文件，并通过电子邮件(使用网页上的链接点)向其他用户发送信息。
A user visiting a Web page also may be able to download file from an FTP site and send messages to other user via email by using links on the Web page.
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