AT&T 6300 Programmer's Manual page 139

Graphics
WINDOW STATEMENT
WINDOW allows you to draw lines, graphs, or
objects in space not bounded by the physical
limits of the screen. This is done by using
programmer-defined coordinates called "World
coordinates.' ,
A world coordinate is any valid single precision
floating point number pair. GWBASIC then
converts world coordinate pairs into the
appropriate physical coordinate pairs for
subsequent display within screen space. To
make this transformation from world space to
the physical space of the viewing surface
(screen), GWBASIC must know what portion of
the unbounded (floating point) world coordinate
space contains the information you want to be
displayed.
This rectangular region in world coordinate
space is called a WINDOW.
Refer to the Reference section for a full
description of the WINDOW statement.
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