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     select(FILEHANDLE)

     select

             Returns the currently selected filehandle.  Sets the
             current default filehandle for output, if FILEHANDLE
             is supplied.  This has two effects: first,  a  write
             or a print without a filehandle will default to this
             FILEHANDLE.  Second, references to variables related
             to  output  will  refer to this output channel.  For
             example, if you have to set the top of  form  format
             for  more  than one output channel, you might do the
             following:

                  select(REPORT1);
                  $^ = 'report1_top';
                  select(REPORT2);
                  $^ = 'report2_top';

             FILEHANDLE may be an expression  whose  value  gives
             the name of the actual filehandle.  Thus:

                  $oldfh = select(STDERR); $| = 1; select($oldfh);