TRACE INVISIBLE USERS ON GTALK

1. Login to Gtalk using your Google id.
2. Go to IM window of user you want to trace for invisible.
3. You will see a drop-down list on right top side,click on it.
4. Click on "go off the record".
5. Now give any message.
6. If the "xyz@gmail.com is offline and can't receive messages right now" message appears in red color it means your friend is really offline.
7. If no message comes means your friend is online and invisible for all.