The following markup names a location and elsewhere creates a hyperlink to the location.
<s1 id=ConfigTopic> Configuration ... <location id=ConfigTopicBody>some text<\location> ... <s1 id=UseTopic> Usage ... See <link ConfigTopicBody>Configuration<\link> for additional information.
The advantage of linking to the ID in the <location> element is that the help window automatically scrolls to the point where the <location> tag is entered. In contrast, a link to the topic's ID ("ConfigTopic" in this case), always goes to the top of the topic.
The <location> element can also reference a position in your file using the predefined entity, (∅), as a placeholder.
Adding this markup at a key position in your file, allows you to create a link to that specific location:
paragraph text . . . <location id=pointA>∅<\location> . . .