In the article, it gives the software design of each hardware module in the system, and narrates the software flow plan of supervisor, entrance machine and resident machine in detail.

文中给出了系统中各个硬件模块相应的软件设计，详细论述了管理机、门口机以及住户分机对应的软件流程策划方案。

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Visual-speaking system based on AT89S51 is introduced in this paper. The structure and function of entrance machine, resident machine and supervisor are analysed.

该文介绍了一种基于单片机AT89S51的可视对讲系统，分析了门口机、室内机、管理机的原理和功能。

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Ammiano says anyone carrying the card will be able to use the city's libraries, public golf courses and health clinics, where that kind of resident proof is needed, and, the supervisor claims, these cards are a safety measure.

NPR: San Francisco to Issue IDs to Immigrants