SECTION./DEFA
ASSIGN/DEFAULT
	assign default devices
SECTION./DISP
ASSIGN/DISPLAY [dev] [file_name]
	define output device for display
SECTION./GRAP
ASSIGN/GRAPHICS [device] [option]
	define the graphic device for plot output
SECTION./INPU
ASSIGN/INPUT [dev] [file_name]
	define input device for writing
SECTION./PRIN
ASSIGN/PRINT [dev] [file_name]
	define output device for printing