Can be simple: NotesUIView.FTSearch ("my search string" , maxDocs)
.. to complex : new NotesUIFTSearch which would be a new object allowing to operate all FT options available in the UI (search by form, how results are sorted,...)
Users are not aware how powerful the FT search is.
They simply type a few words.
But some applications could operate this by creating advanced search query (i.e. Including field name scope [Filed]=xxx, date ranges,...) based on simple questions asked to user in custom-application dialog box for instance.