如果您在设置步骤中进行了某些错误的操作，那么就不会看到这个窗口，而是在shell窗口中看到一条错误消息。
If you've done something wrong in the setup steps, you won't see this window; instead, you'll get an error message in the shell.
重用这些子窗口可以提高某些最常使用的操作所花费的性能时间，这些操作包括读取和创建电子邮件消息，以及创建Calendar条目。
Reusing these child Windows improves the performance time for some of the most frequently used actions — reading and creating email messages and creating Calendar entries.
在的子控件的变化(响应用户操作)的状态下，通过捕捉那些发送一些通知消息到它的父窗口，父窗口消息，执行操作。
When the state of a child control changes (in response to a user action), it sends some notification messages to it's parent window, and parent window by catching those messages, performs actions.
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