NMAKE Help (nmake.hlp) (Table of Contents; Topic list)
U4001
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     NMAKE Warning U4001
 
     command file can be invoked only from command line
 
     A command file, which is invoked by the at sign (@) specifier,
     cannot contain a specification for another command file. Such
     nesting is not allowed. The specification was ignored.
                                    -♦-