       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 mes
              sage set number, and msgnum is the message  number.
              If  the message catalog was not opened, or the mes
              sage set or message number cannot  be  found,  then
              the default string, defaultstr, is returned.
