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─────NMAKE──────────────────────────────────────────────────────────────────
 
     To invoke, or use, a macro, enclose its name in parentheses
     preceded by a dollar sign ($), as follows:
 
          $(macroname)
 
     No spaces are allowed. Macros are case sensitive. If <macroname>
     is null or undefined, it is replaced by a null string. Parentheses
     are optional if <macroname> is a single character. However, they
     are recommended for consistency and to avoid possible errors.
     You can invoke a macro to substitute text within another macro.
     See: ◄Null Macros and Undefined Macros►
          ◄Substitution Within Macros►
 
     Example
 
          program = sample
          L       = LINK
          OPTIONS =
 
          $(program).exe : $(program).obj
            $(L) $(OPTIONS) $(program).obj;
 
     This makefile defines and uses three macros. NMAKE interprets the
     description block as
 
          sample.exe : sample.obj
            LINK sample.obj;
 
     NMAKE replaces every occurrence of $(program) with sample, every
     instance of $(L) with LINK, and every instance of $(OPTIONS) with
     a null string.
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