在计算机编程中，某些软件包提供的一种功能，使用户可在软件运行时就软件包的某些方面获得使用指导信息。
In computer programming, a facility provided by some software packages which enables a user to obtain information on certain aspects of the package during operation.
在计算机编程中，某些软件包提供的一种功能，使用户可在软件运行时就软件包的某些方面获得使用指导信息。
In computer programming, a facility provided by some software packages which enables a user to obtain information on certain aspects of the package during operation.
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