Describe the systematic physics structure and overall scheme of software structure, present the key questions that the real-time online data collection and billing system realizes.

描述了系统的物理结构和软件结构总体方案，并给出了提及联机采集系统实现的关键问题。

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One thing to keep in mind: most software vendors have built and are improving their own time and billing mobile apps for their products which include expense management.

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