prolog_ide(+Action)This predicate ensures the IDE-enabling XPCE component is loaded, 
creates the XPCE class prolog_ide and sends Action to 
its one and only instance @prolog_ide. Action is 
one of the following:
- open_navigator(+Directory)
 - Open the Prolog Navigator (see section 
3.6) in the given
Directory.
 
- open_debug_status
 - Open a window to edit spy and trace points.
 
- open_query_window
 - Open a little window to run Prolog queries from a GUI component.
 
- thread_monitor
 - Open a graphical window indicating existing threads and their status.
 
- debug_monitor
 - Open a graphical front-end for the 
library(debug) library 
that provides an overview of the topics and catches messages. 
- xref
 - Open a graphical front-end for the cross-referencer that provides an 
overview of predicates and their callers.