e specified dockwidget
                           which can be "contents", "index",
                           "bookmarks" or "search".
-hide widget               Hides the specified dockwidget
                           which can be "contents", "index"
                           "bookmarks" or "search".
-register helpFile         Registers the specified help file
                           (.qch) in the given collection
                           file.
-unregister helpFile       Unregisters the specified help file
                           (.qch) from the give collection
                           file.
-setCurrentFilter filter   Set the filter as the active filter.
-remove-search-index       Removes the full text search index.
-rebuild-search-index      Obsolete. Use -remove-search-index instead.
                           Removes the full text search index.
                           It will be rebuilt on next Assistant run.
-quiet                     Does not display any error or
                           status message.
-help                      Displays this help.