如何：使用客户端应用程序服务来实现用户登录。
How to: Implement User Login and Logout with Client Application Services.
进入选课系统之前需进行身份验证，即实现用户登录认证。
Before entering the elective system need to authenticate that user login authentication.
设计一个模拟的系统用户安全登录界面，采用MD5算法实现用户登录口令的安全认证。
The design of a simulation system security log user interface, using MD5 algorithm users log on password security authentication.
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