The principle of users programming for field communication protocol and the development of the software for graphics-oriented programming interface are described.
本文论述了现场通信协议用户可编程的原理，以及面向图形的可编程界面软件的开发。
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Content, on the other hand, is typically more human-oriented — content is what the users on a Web site find helpful, such as graphics, video, sound, and text.