Set up Node/NPM (Node Package Manager) on your machine.
Then, from your home directory (~), run the following commands:
npm install express@2.5 (this installs Express)
npm install socket.io express (this installs Socket.io–an all-browser means of utilizing web sockets)
npm install jade express (this installs the Jade templating engine)
npm install jquery (this installs jQuery, which is currently only used by the server for POSTing to a remote headless instance)
To start the server, run this command:
node app.js
Then in your web browser, navigate to http://localhost:3000.
If you try to use Express 3.0 instead of 2.5, you'll likely get this error: http://stackoverflow.com/questions/10191048/socket-io-js-not-found
You can fix it with:
npm uninstall express
npm install express@2.5