Centaur starts external parsers for any known language on demand, according to the system resources. These parsers continue to run even when you exit Centaur so that you may use them for another session.
N.B. If you create a new parser in batch mode
(from unix), Centaur will not be aware of the change. You must kill the
old parser and start the new one by clicking on the button of the Load pulldown of the main menu.