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       Type          : 53
       Name          : Toggle "Do not disturb"
       Optional Data : None

       This is another multi-line feature only. It allows the  user
       to turn on or off the ability of other users to send him/her
       messages  with  the  type 54 function,  like - "Hey  Joe,  I
       noticed  that you're on line 3.  Wanna chat?" Note that  the
       sysop  has the ability to override this and send  a  message
       anyway.