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When the form is processed, you can retrieve an IO::Handle compatibile
+ handle for a file upload field like this:

...
  }
In a list context, upload() will return an array of filehandles. This 
+makes it possible to process forms that use the same name for multipl
+e upload fields.

use CGI qw(:standard);

$lightweight_fh  = upload('field_name');

...
     print OUTFILE $buffer;
  }
}

use IO::Handle;

Undefined subroutine Fh::handle