Answer: Apparently yes. Check the code used to show how to create and destroy Frame objects. Look at the stop method. Currently it looks like this:

   public void stop ()
   {
      if (f1 != null) f1.dispose();
      if (f2 != null) f2.dispose();
   }

Change it to the following and the consequences are the same:

   public void stop ()
   {
      f1 = null;
      f2 = null;
   }

However, change it to the following and the Frames stick around after the applet is destroyed.

   public void stop ()
   {
      // f1 = null;
      // f2 = null;
   }