hellogoodbye

//app.js
var io = require('socket.io').listen(process.env.PORT || 1337);

io.sockets.on('connection', function(socket) {
	socket.on('hello', function(data) {
		socket.broadcast.emit('goodbye', {
			goodbye : 'goodbye'
		});
	});
});

//hello.html
<script src="http://localhost:1337/socket.io/socket.io.js"></script>
<script type="text/javascript">
	var socket = io.connect('http://localhost:1337');

	socket.on('connect', function() {
		socket.emit('hello', {
			hello : 'hello'
		});
	});

</script>

//goodbye.html
<script src="http://localhost:1337/socket.io/socket.io.js"></script>
<script type="text/javascript">
	var socket = io.connect('http://localhost:1337');

	socket.on('goodbye', function(data) {
		console.log(data.goodbye);
	});

</script>