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  1. or download this
    if ($cgi->param('CHECKPOINT')) {
    local *STATE;
...
    $cgi->save(*STATE);
    close STATE;
  }
  2. or download this
      my $cgi;
  if ($ENV{'CHECKPOINT'}) {
...
  } else {
    $cgi = CGI->new();
  }
  3. or download this
      CHECKPOINT=1 perl -d MyScript.cgi