NPIPE (located in \TOOLKIT\SAMPLES\OS2\NPIPE) demonstrates two-way communication between two unrelated processes using named pipe functions. This sample program implements the game of TicTacToe with two executable files:

• CLINPIPE.EXE (the client)

  The client is the user. For example, the client will:

  • Connect to the server and acknowledge successful connection (START_MSG).
    
  • Notify the server through a pipe when it wishes to begin play (YOU_FIRST or CLIENT_MOVE).
    
  • Notify the server when it wishes to quit (CLIENT_QUIT).
    
  • Send the server a valid move when requested by the server (CLIENT_MOVE).
  
  SVRNPIPE.EXE (the server)

  The server is the computer. For example, the server will:

  • Connect a pipe to the client through which play will be executed (START_MSG) upon the initial request of a client to play.
    
  • Play with many clients simultaneously.
    
  • Notify the client of the server's move, and request a valid move from the client (SERVER_MOVE).
    
  • Notify the client of game-end (WIN_SERVER, WIN_CLIENT, WIN_DRAW).

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