The functions for finding and replacing text in Help+Manual are very similar to the comparable functions in word processors, with some additional options for the special requirements of help projects.
In addition to this the program also has powerful functions for locating individual topics by their topic IDs and their context numbers, and for locating "referrers", i.e. topics containing links to the current topic or topics.
The Search function is also available in the XML Source editor tab (Professional and Server versions only) and all HTML editor windows for HTML templates and other editing windows. Just right-click in these editor windows to access.
Find & Replace (Reference)
Find Referrers (Reference)