GetClientRect( hWnd ) -> <aRect>
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 PARAMETER:

  <hWnd>        Is the handle that identifies the window


 RETURNS:

  <aRect> is a Clipper array with the 4 elements nTop, nLeft, nBottom 
  and nRight, measured in pixels. The left and top members will be zero,
  while the right and bottom members will contain the width and height of 
  the window. 


 DESCRIPTION:

  This function retrieves the dimensions of the window client area. The 
  client coordinates specify the upper-left and lower-right corners of the
  the client area. 
  Because client coordinates are relative to the upper-left corner of a 
  window's client area, the coordinates of the upper-left corner are (0,0). 


 SOURCE:

  SOURCE\WINAPI\RECTS.C