       catgets catHandle setnum msgnum defaultstr
              Retrieve a message form a message catalog. CatHandle should be a
              Tcl message catalog handle that was returned by catopen.  Setnum
              is  the message set number, and msgnum is the message number. If
              the message catalog was not opened, or the message set  or  mes-
              sage  number  cannot be found, then the default string, default-
              str, is returned.
