Most topics have entries in the Table of Contents (TOC). However, sometimes you also need topics that are not included in the TOC. For example, topic files without TOC entries are required for popup topics, and they are recommended for topics that are displayed in external windows in HTML Help. You can also use them for topics that are only displayed when the user clicks on a link.
To create a topic file without a TOC entry you just create the file in the Topic Files section of the Project Explorer instead of in the Table of Contents section.