for ($i=0; $i<`#of children to do`; $i++;) {
  $pid[$i]= open($created_file_handle, "$custom_call_statement -|");
  if ($pid[$i]) { waitpid($pid[$i], 0); }  # parent waits for child to finish
      } else { 
        while (<$created_file_handle>) { $out[$i] .= $_; } # add output to the array
    exit; 
  }
}