AT&T 6300 Programmer's Manual page 514

WINDOW
Statement
7-358
The following example illustrates two lines
with the same endpoint coordinates. The first
is drawn on the default screen, and the second
is on a redefined window.
200 LINE [100,100] - [150,150], 1
220 LOCATE 2,20:PRINT liThe line on the default screen"
240 WINDOW SCAEEN [100,100]-[200,200]
260 LINE [100,100] - [150,150], 1
280 LOCATE 8,18:
300 PRINT U& the same line, new window"