Hangup:
~~~~~~
     Cmdkeys : "HC"
     Function: Carefull logoff of user
     Option : [<string>]

               <string> is printed, and the user must enter either Yes or
               No.  If Yes is entered, LOGOFF.* is displayed and the user
               is logged off.

     Cmdkeys : "HI"
     Function: Immediate logoff of user
     Option : None

     Cmdkeys : "HM"
     Function: Display string and logoff user
     Option : [<string>]

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