interface PingObject
{
  // = DESCRIPTION
  //   An interface to ping-pong between two objects, it is used to
  //   test a very interesting use-case reported by Andreas Geisler.

  oneway void ping (in PingObject callback);
  // The ping method, the server should respond by invoking <pong> on
  // the <callback> object

  oneway void pong ();
  // A response from the server

  oneway void shutdown ();
  // Shutdown the peer
};