当用户请求关闭或者退出时，程序弹出保存修改的对话框，因为这时不得不同步内存中的文档复制和磁盘上的文档复制。
Save Changes dialog box when the user requests Close or Quit because that is the time when it has to reconcile the differences between the copy of the document in memory and the copy on the disk.
所有的变更请求都被关闭了或者合并进入需求了吗？
Were all change requests either closed or incorporated into the requirements?
在收到关闭请求时，当前的任意字符串将被发送回客户机。
When a shutdown request is received, the current random string is sent back to the client.
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