TinTin++ Mud Client Manual
         BELL

Command: #bell {flash|focus|margin|ring|volume} {argument}

         The #bell command without an argument will ring the terminal bell.

Example: #action {Bubba tells you} {#bell}

         If you aren't watching the screen this could be useful if you don't
         want to miss out on a conversation with Bubba. Alternatively you can
         use #system to play a sound file.

         Some terminals will allow you to use VT100 Operating System Commands
         to change the terminal's bell behavior which can be used to flash the
         taskbar icon and or focus the window on receival of a bell.

Example: #action {Bubba tells you} {#screen save title;#screen set title Tell!;
           #bell ring;#delay 10 #screen load title}

         The above example will save your window title, change the title to
         'Tell!', ring the bell, next reset the window title after 10 seconds.

         It's possible to set the terminal to pop to the foreground upon
         ringing of the alarm bell.

Example: #bell focus on;#bell ring;#bell focus off

         It's possible to adjust the alarm bell volume on some terminals.

Example: #loop {1} {8} {cnt} {#line substitute variables
           #delay {$cnt} {#showme Volume $cnt: #bell volume $cnt;#bell}

Related: screen