Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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High/Low-Order Byte
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  Syntax:   HIGH expression
            LOW expression
 
  See also: HIGHWORD, LOWWORD, OFFSET
 
  Description:
 
     The HIGH operator returns the high-order (most significant) byte
     of <expression> in two's-complement form. The LOW operator returns
     the low-order (least significant) byte of <expression> in two's-
     complement form. The <expression> must resolve to a constant or
     an OFFSET expression.
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