On the server level, these IDs can be mapped to application-specific information such as presence.

在服务端层面，这些ID可以被映射到应用相关的信息中，比如用户名等。

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The second parameter (state) can either be null or an object containing application-specific information.

public void TimerCallback(object state);第二个参数（state）可以为空或者是包含程序规范信息的对象。

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Therefore, you still need a utility class if you want to add application-specific information to the events.

因此，如果您想将应用程序的特定信息添加到事件中那么仍旧需要工具类。

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What if we could share the core technology of an application that combines geo-specific information, like a power outage, with real-time alerts?

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