Google mail or Google chat Remote logout feature

Most of the people will use Gmail, because it's simple and easy to access chat & mails in one place. Sometimes we login at work place or internet café, if you feel someone is accessing your mailbox, you can check using Account activity feature in Gmail.

Last account activity
Clicking the Details link next to the Last account activity line at the bottom of any Gmail page shows information about recent activity in your mail.

How to use this data
If you're concerned about unauthorized access to your mail, you'll be able to use this data to find out if and when someone gained access.

Your current IP address is displayed below the Recent activity table.

Concurrent sessions
If your mail is currently being accessed from another location, we'll list the other session(s) in the Concurrent session information table. This could mean that you simply have another browser window open with Gmail loaded, or that your home computer is logged in to Gmail while you're accessing your mail from work. If you're concerned about any concurrent access, you can sign out all sessions other than your current session by clicking Sign out all other sessions.