Query all available window types.

::query_window_type returns a tupel which contains all devices or software systems, respectively, which are used to display image objects. You may use ::query_window_type usefully while developing machine independent programs. Possible values are:

 'X-Window'         X-Window Version 11.

 'pixmap'           Windows are not displayed, but managed in memory.
                    In this manner it is possible to port Halcon\ programs to
                    computers without graphical display.

 'PostScript'       Objects are output to a PostScript File.

::query_window_type always returns H_MSG_TRUE.

::reset_obj_db

System