"%LABEL n" is the debugger syntax for referring  to  label  n  in
     your  program.  This is intended for languages like FORTRAN which
     have numeric program labels.  You can qualify the  label  with  a
     pathname specifying the containing module.  For example:

     SET BREAK MODULENAME\%LABEL 10

     The "old" syntax of "%LABEL MODULENAME\10" is no longer accepted.