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17.9 X Graphics

MIT/GNU Scheme supports graphics in the X window system (version 11). Arbitrary numbers of displays may be opened, and arbitrary numbers of graphics windows may be created for each display. A variety of operations is available to manipulate various aspects of the windows, to control their size, position, colors, and mapping. The X graphics device type supports images, which are implemented as Xlib XImage objects. X display, window, and image objects are automatically closed if they are reclaimed by the garbage collector.