module Tictactoe {
  exception BadTag {};
  exception InvalidMove {};
  exception AlreadyConnected {};

  interface Client {
    // Connect to another client, return a tag for future communication
    long   connect    (in Client opponent) raises (AlreadyConnected);

    // Disconnect from the game
    void    disconnect (in long tag) 
      raises (BadTag);

    // Put a mark at given position
    void    put        (in long tag, in short row, in short column) 
      raises (BadTag, InvalidMove);

    // Request starting the game over
    boolean request_reset (in long tag)
      raises (BadTag);

    // Response to request_reset
    void reset         (in long tag, in boolean ok)
      raises (BadTag);
  };
};