my $value = $clients{$old_key};
  $new_client_hash{$new_key} = \$value;
  $new_client_hash{$old_key} = \$value;

##</code><code>##

  $new_client_hash{$new_key} = $clients{$old_key};
  $new_client_hash{$old_key} = $clients{$old_key};