Windows 8.1 apps are revolutionizing development on the Windows platform. Fast, fluid, tactile and chrome-free, they provide a brand-new look and feel for Windows users. These apps rely on Microsoft's Windows 8 modern UI to provide their rich and engaging user experiences for both desktop and tablet users. The new UI in turn relies upon the Windows Runtime (WinRT) to give its apps unparalleled flexibility and power. Understanding this stack of new technologies and how they ti