GetDialogBaseUnits()-> <nBaseUnits>
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 RETURNS:

  <nBaseUnits> is a long value ( 4 bytes ), with the low-order word of the
  return value containing the width in pixels and the high-order word 
  containing the height of the current dialog box base-width unit


 DESCRIPTION:

  This function returns the DialogBox base units used by Windows when 
  creating DialogBoxes. An application should use these values to calculate
  the average width of characters in the system font.
  The dialog box unit in the x-direction is one-fourth of the width
  returned by the GetDialogBaseUnits function,  and in the y-direction it 
  is one-eighth of the height returned by the function. 

  To use GetDialogBaseUnits to determine the height and width ( in pixels )
  of a control, given the width (x) and height (y) in dialog box units, use
  the following formulas: 

   +-------------------------------------------------------------+
   |    nWidth  = ( x * nLoWord( GetDialogBaseUnits() ) ) / 4    |
   |    nHeight = ( y * nHiWord( GetDialogBaseUnits() ) ) / 8    |
   +-------------------------------------------------------------+

  To avoid rounding problems, perform the multiplication before the
  division, in case the dialog box base units are not evenly divisible by
  four. 

  Fortunatley, FiveWin controls all these processes automatically through
  the TDialog Class and DialogBoxes xBase commands.


 SOURCE:

  SOURCE\WINAPI\DLG2CHR.C