sentences:  Once the user is logged in, the login token may be used to track what actions the user has taken while connected to the site.Logging out may be performed explicitly by the user taking some actions, such as entering the appropriate command or clicking a website link label as such.It can also be done implicitly, such as by the user powering off his or her workstation, closing a web browser window, leaving a website, or not refreshing a website within a defined period.