context identifier

基本解释

Call this member function to retrieve the help context identifier, if any, associated with the window.
调用这个函数以获得与窗口相关的帮助上下文标识符，如果有的话。
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If a child window does not have a help context identifier, it inherits the identifier of its parent window.
调用这个成员函数以将帮助上下文标识符与指定的窗口相关联。
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Retrieves the library's documentation string, the complete Help file name and path, and the context identifier for the library Help topic in the Help file.
撷取程式库的文件字串、完整的说明档名称和路径，以及说明档中程式库说明主题的主题代码。