oWin:HScroll( <nMsg>, <nLParam> ) -> < 0 >

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 PARAMETER:

   <nWParam>   Scrollbar message ( SB_xx )

   <nLParam>   additional Parameter ( as 32 bit LONG INTEGER )
               The high word of this parameter contains the handle of the 
               scrollbar.


 DESCRIPTION:

  Processes the WM_HSCROLL messages that are sent to this window
  object. This method handles both the messages for a scrollbar that is 
  connected to a window or a particular horizontal scrollbar control.
  The SB_xx Scrollbar Messages are then translated into the
  appropriate messages to the ::oHScroll object.