Socket.io usage in Node.js

gistfile1.js

// create an http server listening on port 8000
var io = require('socket.io').listen(8000);

// listen on new connections
io.sockets.on('connection', function (socket) {

	// listen on an event called "eventA"
  	socket.on('eventA', function(data) {

		// send "eventA" to all clients, except the sender
		io.sockets.emit('eventA', data);

  	});

});