The central class of object for manipulating graphics is the
Territory. A territory has the ability to display data, be moved
and raised or lowered relative to other territories. The concept is
very similar to that of windows in the X11 world, except that the
programmer has more control over their movement. They provide the
means by which functions reference the display, and allow input from
the user. The coordinate frame used by territories is that of
X-windows: X ordinates increasing left to right and Y ordinates
increasing from top to bottom, both relative to the top left corner of
the territory. There is no facility to rescale these at the server
layer.