Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
High/Low-Order Word
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  Syntax:   HIGHWORD expression
            LOWWORD expression
 
  See also: HIGH, LOW, OFFSET
 
  Description:
 
     The HIGHWORD operator returns the high-order (most significant)
     word of <expression> in two's-complement form. The LOWWORD
     operator returns the low-order (least significant) word of
     <expression> in two's- complement form. The <expression> must
     resolve to a constant or an OFFSET expression. These are similar
     to the HIGH and LOW operators of MASM 5.1 except that
     HIGHWORD and LOWWORD can take only constants as operands,
     not relocatables (labels).
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