Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Word Size Equate
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  Syntax:   @WordSize
 
  See also: OPTION SEGMENT:, FLAT Memory Model, .386, .486
 
  Description:
 
     Predefined equate returning the size of a word. In default 16-bit
     mode, @WordSize returns 2. On 80386/486 processors in a 32-bit
     segment (such as the FLAT model), @WordSize returns 4.
 
     Outside of a segment this equate returns the default word size as
     set by a processor selection directive or the OPTION SEGMENT:
     directive.
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