Click above to get retro games delivered to your door ever month!

   A Radio button control is used to select from a set of related but
   mutually exclusive choices. The value selected will be used to evaluate
   the associated symbol (field or variable). Graphically, the Radio button
   is represented by a small circle and a text caption.

   A filled circle (with a dot inside) indicates the actually selected
   Radio button. During edit, the Radio button is selected by highlighting
   the value and pressing the Space Bar, or by clicking with the mouse.
   Each time a value is selected, the dot is transfered from the previous
   Radio button to the chosen one.

   To associate one or more Radio buttons to a field, the field to which it
   refers must be indicated, and which value this field is to assume when one
   of the Radio buttons is selected. These choices can be set in the
   properties environment of the Radio button.

   After having created the Radio button control (Alt-F1 keys), the
   Space Bar is used to activate its Definition Frame.