In the essay it also introduces the development tools and USB's soft model in details, and presents the process of driver programming and application programming.

本论文中详细介绍了驱动程序的开发工具和usb总线的软件模型，以及驱动程序、应用程序设计的过程。

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AUTOLISP language provides one of the secondary development tools of AUTOCAD for the user. AUTOLISP language is an important part of AUTOCAD soft.

AUTOLISP语言是AUTOCAD提供给用户的主要二次开发工具之一，它是AUTOCAD软件包的重要组成部分。

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AUTOLISP language provides one of the secondary development tools of AUTOCAD for the user. AUTOLISP language is an important part of AUTOCAD soft.

AUTOLISP语言是AUTOCAD提供给用户的主要二次开发工具之一，它是AUTOCAD软件包的重要组成部分。

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