TinTin++ Mud Client Manual
         SNOOP

Command: #snoop {session name} {on|off|scroll}

         If there are multiple sessions active, this command allows you to
         monitor what is going on in the sessions that are not currently active.
         The line of text from other sessions will be prefixed by the session's
         name.

         You can toggle off snoop mode by executing #snoop a second time.

         By using the scroll argument you will snoop the session's scroll
         region which will overwrite the display of whichever session is active.
         You can change the size and location of a session's scroll region by
         using the #split and #screen scrollregion commands.

Related: all, port, run, session, sessionname, ssl and zap.