The foreign family 11!:x is the J-Windows interface.
All 11!:x verbs are rank 1.
wd commands are executed when x is 0 ( 11!:0 ).
gl2 commands are for 2D (GDI) graphics (x between 2000 and 2999).
fontspec is several parameters that specify a font.
isigraph events support character and mouse events.
Mapping Mode affects how logical units are mapped onto the display surface.
gl3 commands are for 3D (OpenGL) graphics (x between 3000 and 3999)
OpenGL printing for printing OpenGL images by creating a bitmap RC, drawing to the bitmap, and then printing the bitmap.