title: Android moving back to first activity on button click
body: <p>I am writing a application where I am dealing with 4 activities, let's say A, B, C &amp; D. Activity A invokes B, B invokes C, C invokes D. On each of the activity, I have a button called "home" button. When user clicks on home button in any of the B, C, D activities, application should go back to A activity screen ?</p>
  
  <p>How to simulate "home" button in this case ?</p>