Sign out all other Google Mail web sessions

If you have some Google login sessions in other computers that you forgot to logout, you can remotely logout the sessions.

1. Login Gmail.
2. On the Inbox page, scroll down to the bottom.
3. At the bottom right corner, it prints "Last account activity" and "Details".
4. Click on the "Details" link and an "Activity information" dialogue is shown.
5. Click on the "Sign out all other Gmail web sessions" button.