Ok, folks.
  1. Notice that the right frame is reloading every 15 secs.
  2. Now select this link and wait another 15 secs.
  3. You should notice - old refresh is still working!
  4. Now select this link and select the link in the right frame
  5. Notice that right frame is refreshing every 15 secs again.
  6. Select this link and wait another 15 secs.
  7. Wait for 15 secs and notice that old refresh is working in this case too.