Your first real-time web application

To get a better understanding of how all these components fit together, we're going to develop our first real-time web application based on Node.js and RethinkDB. If you've never developed a web app before, this is going to be very exciting for you!

You maybe wondering what we're going to build. We're going to develop a web application that allows us to create colored "notes" containing messages that can be dragged around the screen. The interesting thing about this web application is that it's completely real time. Everything you do will be reflected in real time on all connected clients. What this means is that if you open two browser windows and drag a note around, the same note will be animated in the other browser window. The same thing happens when you create or delete notes. All the changes will appear in real time in all the open browser windows without the need of reloading the page.

If you're curious, the application we're going to build looks...