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   A Check box control is used to display a setting choice in a group of
   setting choices that are not mutually exclusive. Check boxes are
   appropriate for choices that have two clearly discernible states (Yes or
   No, True or False). The value selected will be used to evaluate the
   associated symbol (field or variable). Graphically, the Check box is
   represented by a small square and a text caption.

   The check mark ( . ) sign within the square indicates that the
   value of the element associated to the Check box is on. Without the
   check mark, the Check box is 'off'. During edit, the Check box is
   checked or unchecked by highlighting it and pressing the Space Bar, or
   by clicking with the mouse.

   In the definition of a Check Box, it is necessary to specify which symbol
   is associated to it, and establish the values when it is checked or
   unchecked.

   After having created the Check Box control (Alt-F1 keys), pressing the
   Space Bar key will activate its Definition Frame.