sio.js

var
  express = require("express")
  app = express()
  sio = require("socket.io"),
  server = require('http').createServer(app)
  io = sio.listen(server);

server.listen(3333);

io.sockets.on('connection', function (socket) {
  io.sockets.clients().forEach(function( s ){
		socket.emit( "dummy" );
	});
});