which grob?

[Han]

(11-16-2015 10:46 PM)ji3m Wrote:  In the following program

export spin ()
begin
Rect_P (); <--- who does this clear.?
CHOOSE (...); <--- where does this draw
TEXTOUT_P("hello",0,0); <-- where does this draw
while 1 do end;
end;

What grob am i writing to.?

if i break out i return to the starting screen.
The choose box opens on top of the starting screen which is untouched.

What exactly is the graphics paradigm here?

Type: RECT_P and with the cursor somewhere in that command name, press the help key for all the information on that command. But to answer your question, when no graphics object is specified, the default G0 (current display) is always used.