This feature will be useful for those who suspect their account is hacked. Gmail now displays the date and time your account was last accessed as well as the IP address that was used to login to the account.
Clicking on the 'Details' button will display a table of what protocols (POP3, IMAP, etc) were used to access the account and includes a button which you can use to sign out all other login sessions of your account (if any).
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