-If the help viewer is not running, runs it, and searches for sections matching the given keyword. If one
-match is found, the file is displayed at this section.
+If the help viewer is not running, runs it, and searches for sections matching
+the given keyword. If one match is found, the file is displayed at this
+section. The optional parameter allows the search the index
+(wxHELP\_SEARCH\_INDEX) but this currently only supported by the
+wxHtmlHelpController.