the name the display on which the
graphics window will appear.
The default is to use the value in the user's
environment item DISPLAY.
width
the width of the plotting window in inches.
height
the height of the plotting window in inches.
Description
This function starts a graphics device driver
for the X Window System (version 11).
This should be done automagically at start up time
and can only be done on machines that run X.