If your goal is to develop for true cross-device communication, you may want to consider the Webinos framework. This open source, browser-based application platform is co-funded by the European Union together with major players such as BMW, Samsung, Sony, and the W3C. It’s intended to simplify communication between devices, ranging from in-car systems to mobile devices to your TV.
Because Webinos is browser based, it uses web platform technologies; it’s even built on top of Node.js and uses HTML5 WebSockets for communication. The first release was in 2012 and development is ongoing, but its potential is already exciting.