The last part introduces some key data structures first, and then the functions that operate over Data Gate and USB device, and finally the multithread technology adopted in the application program.

在应用程序开发部分，先引入核心的数据结构，接着分别介绍了对数据网关和USB 设备的操作，最后介绍了应用程序采用的多线程技术。

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Dick Lynch, chief technology officer of Verizon Wireless, explains that no wide-area wireless network can afford to build out wide-area data capacity to handle bursts of demand for wireless data that change from airport gate to gate every 30 minutes or so.

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"The market for this type of data and packaging is just out of the gate, " says Jay Sears , head of development for Edgar Online in South Norwalk, Conn.

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