Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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MASM 5.1 Compatibility
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     See also: % (Macro Substitution), OPTION NOKEYWORD:
 
     You cannot make %OUT into a legal identifier with the
     NOKEYWORD option, although it is a reserved word. You can make
     the OUT instruction into a legal identifier. If you use the
     % operator with OUT to do substitution, you must put a space
     between the % and OUT.
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