title: What is exacly ms_nfp_launchargs in Windows Phone?
body: <p>If we want to get to the run parameters of the application we write:</p>
  
  <pre><code>NavigationContext.QueryString.TryGetValue("ms_nfp_launchargs", out value);
  </code></pre>
  
  <p>What is exacly <code>ms_nfp_launchargs</code>? Where is it defined? What is the background of that value?</p>
  
  <p>I know that it is a key, but I want to know more.</p>