如果您有正在运行的自定义应用程序，则可以在这些呈现阶段中调用您的自定义代码。

If you have a custom application running, then your custom code might be invoked during these rendering phases.

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用户会看到一些等待图示，表示应用程序正在运行过程中，但是用户并不需要更复杂的过程来发送更多交互请求。

The user sees some sort of spinner that indicates the application is working, but the user is not tying up a mongrel process that could serve more interactive requests.

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所有这些都将外部化，从而极大地简化了编程模型，并使得对外部提供程序的更改以实时的方式反映到正在运行的应用程序中。

All of this would be externalized, greatly simplifying the programming model, and enable changes to be made to the external provider to be reflected real-time in the running application.

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