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 KeyChar         Action to be performed when pressing a key
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   Syntax: KeyChar( <nKey>, <nFlags> ) --> 0 or Nil

   Parameters:

   <nKey>      The value of the key 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.

   Returns:
   The KeyChar() method returns either 0 or Nil. It will return 0 if it
   has handled the keystrokes and it will return the value of it's
   ancestors (TWindow) KeyChar() method if it has passed the parameters
   to that KeyChar() method

   Comments:
   This method handles all the WM_CHAR messages Windows sends to this
   particular object. This method receives both the keycode and a set
   of flags which can be used to determine more about the keystroke.
   For controls it will handle the messages relating the <Tab> and
   the <Shift> <Tab> keystrokes.