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@WORDSIZE        Indicates 16- or 32-Bit Segments        Predefined EQU

  @WORDSIZE

     This predefined equate returns a value of 2 if the current segment is a
     16-bit segment, and 4 if the current segment is a 32-bit segment
     (. 80386). This can be useful when you are working with specific
     addresses, or need to know whether an extended register is appropriate.