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use OpenPlugin();

...
$OP->session->fetch( $session_id );
$OP->param->get_incoming( "param_name" );
$OP->httpheader->send_outgoing();

  # This seems long
  my $session_obj = OpenPlugin::Session->new();    
  $session_obj->fetch( $id );

 # This is short!
 $OP->session->fetch( $id );

  $session_obj = $OP->session;
  $session_obj->fetch();

  $session_obj = OpenPlugin->new( 'session', $params );
  $session_obj->fetch();

OpenPlugin::Plugin (baseclass for all plugins)
       |
OpenPlugin::Session (session plugin, the parent of the session driver)
       |
OpenPlugin::Session::File (session driver)