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OS/2 graphics devices are created by specifying the symbol
os/2 as the graphics-device-type argument to
make-graphics-device. The OS/2 graphics device type is
implemented as a top-level window and supports color drawing in addition
to the standard Scheme graphics operations.
Graphics devices are opened as follows:
(make-graphics-device 'os/2 #!optional width height)
where width and height specify the size, in pixels, of the drawing area in the graphics window (i.e. excluding the frame).