Proof of concept on realtime visits tracking.

realtime_tracking.coffee

express = require 'express'
io = require 'socket.io'
ck = require 'coffeekup'
app = express.createServer()

app.get '/', (req, res) ->
  res.send ck.render ->
    @title = 'WebSockets tracker'
    doctype 5
    html ->
      head ->
        title @title
        script src: 'http://code.jquery.com/jquery-1.4.3.min.js'
        script src: '/socket.io/socket.io.js'
        coffeescript ->
          $().ready ->
            socket = new io.Socket()
            socket.on 'message', (data) ->
              $('body').append "<p>#{data}</p>"
            socket.connect()
      body ->
        h1 @title

app.get '/track', (req, res) ->
  socket.broadcast req.header 'user-agent'
  res.send 'tracked!'

app.listen 5678
socket = io.listen(app)