We can sign out form gmail remotely if we have any sessions opened at other locations. To release all the sessions
1. Login to gmail
2. Scroll to the bottom
3. Click on the Details link at Last account activity
4. Click sign out all other sessions in the dialog box

#1 by Michael Kleinert on August 11, 2011 - 11:08 am
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Amazing how gmail has so many features, yet tucked away in hard-to-find places. I’m surprised they have not improved overall usability of the interface by now, but I appreciate your helpful tip here.