In 2011 we learned how to build apps that run across multiple devices with different capabilities and screen sizes. Now in 2012 we will start building apps that communicate between these devices and not only with existing cloud based web services. We want to show how you can access services on your phones from your tablet, or vice versa, in a simple and effective way. Learn how to write apps that allows you to discover other devices, how to effectively implement web services that run on your device and how to make these services secure.