title: Home key press behaviour
body: <p>While developing a sample android application i have constructed two activities
  1)Activity 1
  2)Activity 2</p>
  
  <p>Now Activity 2 is the foreground activity whereas Activity 1 is the background one. Now user presses Home key. The application(i.e. both the activities) dissappear. Now is we relaunch the application we see Activity 1 as the foreground activity. My question is:</p>
  
  <p>1)Does the platform maintain any history entry when pressed home key?
  2)How do we take the user to the last launch activity on relaunching the application?</p>