title: Has requestCode in PendingIntent always been supported?
body: <p>I'm trying to distinguish between different instances of PendingIntent by having separate requestCode for each use-case as suggested by <a href="https://stackoverflow.com/questions/3730258/mulitple-instances-of-pending-intent">this</a> earlier question.</p>
  
  <p>Is this a robust solution? Has requestCode always been supported even though the <a href="http://developer.android.com/reference/android/app/PendingIntent.html" rel="nofollow noreferrer">javadocs</a> still say that it is "currently not used"?</p>