Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Segment Override Operator (:)
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  Syntax:   segment:expression
 
  See also: SEG, SEGMENT, GROUP, ASSUME, Labeling (:/::)
 
  Description:
 
     Overrides the default segment of <expression> with <segment>.
     Forces the address of the variable or label to be computed
     relative to the specified segment.
 
     Parameter      Description
 
     segment        A segment register (CS, DS, SS, ES, FS, or GS),
                    group name, segment name, or segment expression.
 
     expression     A memory expression.
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