这个信息叫做会话状态，是有用的应用程序的重要部分。
This information is called session state and is an important ingredient of a useful application.
下半部分提供逻辑日志的状态信息。
The second half provides the status information of the logical logs.
您可能记得，在 第 5 部分中，我们描述了名为 PackageTrackingService 的服务，该服务可以传递关于特定服务的状态的信息。
You may remember that in Part 5, we described a service called PackageTrackingService, which could deliver information about the status of a particular service.
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