Introduction    Menus
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 AddItem()       Adds a selectable item to a submenu
 AddLine()       Adds a divider line to a submenu as a non-selectable item
 DelItem()       Deletes an item from a Submenu
 DispMenu()      Activates a menu that has been previously created
 OffItem()       Deactivates one item of a submenu
 OnItem()        Reactivates an item of a submenu
 NewMenu()       Creates a new menu structure
 READ            @ SAY..GET format for Radio Buttons