"The root of the gadget hierarchy in a window is a special gadget which is rarely operated on directly, but it is helpful to know it exists:"
{ $subsections world }
"There is also syntax for defining a main window as the entry point for a vocabulary:"
-{ $subsections POSTPONE: MAIN-WINDOW: }
+{ $subsections POSTPONE: MAIN-WINDOW: } ;
ARTICLE: "ui-backend" "Developing UI backends"
"None of the words documented in this section should be called directly by user code. They are only of interest when developing new UI backends."