当你实现一个登录限制的时候，小心不要把那些不需要用户身份认证的功能也锁起来。
When you implement a log-in barrier, be careful that you don’t lock away features that don’t really need user identification.
除了存储用户信息外，在LDAP中定义用户还可以使一些可选特性得到启用，例如限制登录的数量。
In addition to storing user information, defining users in LDAP allows for such optional features as limiting the number of logins.
有了可用的登录和注销框架之后，限制对某个操作的访问就非常简单了。
Once you have a working login and logout framework, it's extremely easy to restrict access to certain actions.
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