title: What is the Windows Phone Runtime?
body: <p>I've always understood "runtime" to mean the point at when an application is running. But, watching the videos from Microsoft Academy they referrer to "Windows Phone Runtime and API's".</p>
  
  <p>Is it called the Windows Phone Runtime because you applications interact with the Windows Phone OS - which is obviously running, hence "Runtime"? Or have I missed the point?</p>