Data File

  You can specify the location of the data file using the logical name
  CXX$DEMANGLER_DB.  For example, if the data file is in your login directory 
  and is named MYCXXDB.DAT, you would define the CXX$DEMANGLER_DB logical 
  name as follows:

     $ DEFINE CXX$DEMANGLER_DB SYS$LOGIN:MYCXXDB.DAT

  If you do not define the CXX$DEMANGLER_DB logical name, CXXDEMANGLE 
  looks for the data file in the repositories specified by the /REPOSITORY 
  qualifier.  If you do not specify the /REPOSITORY qualifier, CXXDEMANGLE
  looks for the data file in the sys$disk:[.cxx_repository] directory.