当构建一个后端程序时，最好是首先检索PID或只是检索条目的属性。

When building a back-end program, it is best to first retrieve the PIDs or only the attributes of an item.

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如果一个后端程序必须和用户交互，它应该启动前端进程或者将消息转发给前端进程来进行。

If a background process must communicate with the user, it should start or bring forward the foreground application.

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如果您正在构建后端程序，该程序需要增加属于条目的部分，那么首先请检索满足查询的条目的PID。

If you are building a back-end program that would augment parts belonging to an item, first retrieve the PIDs of the items that satisfy the query.

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