This accessible-for-notify DisplayString carries the authenticated username of the logging-in user, or otherwise the login mode (Console, AUX, TTY, VTY, etc.) when no authenticated username applies, and is only populated as a varbind in login/logout/auth-failure traps. An admin's trap receiver uses this to identify who (or what interface) triggered a login-related event on the H3C/HPN device. For example, an hpnicfLogIn trap might carry the value 'admin' if a named user authenticated, confirming who just logged into the switch.