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 KeyDown         Action to be performed when pressing a control key
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   Syntax: KeyDown( <nKey>, <nFlags> )  --> Nil

   Parameters:
   <nKey>      The value of the non-system key that was pressed.

   <nFlags>    Specifies the repeat count, scan code,
               extended-key flag, context code, previous key-state
               flag, and transition-state flag, For more information on
               these flags please consult the MS-Windows API
               documentation.

   Comments:
   This method handles all the WM_KEYDOWN messages Windows sends to
   this particular object. These messages are sent when a window has
   keyboard focus and when a NON-SYSTEM key (the <Alt> key was NOT
   pressed) is pressed. This method receives both the virtual keycode
   and a set of flags which can be used to determine more about the
   non-system key that was pressed.