title: How to avoid having my app shown in the list of recently used apps
body: <p>On <code>Ice Cream Sandwich</code> the user can see a list of the recently used applications with a screenshot of the the last status of the <code>UI</code>.
  I'm working on an application that shows confidential information that should not be kept in memory in any way.
  Is there a way to disable that feature?</p>