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Switchboard class.

This class is used to coordinate updates among all Viewers.  Every Viewer must
conform to the following interface:

    - it must include a method called update_yourself() which takes three
      arguments; the red, green, and blue values of the selected color.

    - When a Viewer selects a color and wishes to update all other Views, it
      should call update_views() on the Switchboard object.  Note that the(more...)