Context-sensitive help is information provided to users based on the context of the task in which they are involved.
Word-2-CHM Standard Edition does not support help Id. The CHM file created by this edition only provide context-sensitive help via topic path by using command-line.
Word-2-CHM Professional Edition can create help Id and definition file automatically. Context-sensitive help of the CHM file created by it can be invoked by command-line and help Id.
How to scroll to specified place in specified topic in my program?
Page Filename Rule Details
Using Html Help API