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To Logout (or Log out or log-out, or in IBM parlance, to signoff or sign off) refers to the process of ceasing use of a computer system by removing the user credentials. This may be done explicitly by the user entering the appropriate command to log out or on an internet website clicking a link labelled as such, or implicitly by powering the machine off, closing a web browser window or leaving the site or not refreshing a webpage within a defined period.
In the case of internet usage, when the user logs out, session-only cookies from that site will be deleted from the user's computer. In addition, the server invalidates any associations with the session, making any session-handle in the user's cookie store useless. This features comes in handy if the user is using a public computer.
After logging out, the user must always login (or sign on, in IBM parlance) again.
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