A project meant for single sourcing can include topics that are not relevant in all types of output generated from the project. For example, a project with multiple TOCs includes topics that are not relevant to the output that you generate based on a single TOC. In such a case, excluding unreferenced topics from the output ensures that users find only the relevant topics in navigation and search.
RoboHelp considers a topic unreferenced if the topic is not referenced by the following project components:
•CSH map IDs
•See Also keywords
•Related Topics keywords
The Exclude Unreferenced Topics From Output option is available in Adobe AIR, WebHelp, WebHelp Pro, FlashHelp, FlashHelp Pro, Microsoft HTML Help, XML Output, Oracle Help, and JavaHelp layouts.