Created by Ricardo Cabello aka Mr.doob, Multiuser Sketchpad is an online sketching pad in your browser allowing many users to draw simultaneously. Having heard people talk about node.js on Twitter, Ricardo was interested to see whether he could apply it to his Harmony project. Node.js is a tool to provide an easy way to build scalable network programs. Many client connections can be handled concurrently allowing each connection only a small heap allocation. The first implementation of node.js by Ricardo allowed approximately around 100 simultaneous users where now, Ricardo has mentioned at least double that number.