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       Terminal presentations via SSH + read-only tmux
       ===============================================
       
       Have semi-trusted people connect to your machine via SSH. They immediatly
       attach to a read-only tmux-session and can do nothing but watch.
       
       I always liked the idea of having the ability to quickly let someone look
       at something I do in the terminal in realtime.
       
       This can be useful for many scenarios:
       - holding presentations,
       - tutoring commandline
       - pair programming
       - sharing gameplay (e.g. nethack)
       
       I'm well aware that this can be achieved by fully sharing your graphical 
       screen like in Discord, Slack or Teams. But i find these methods lame,
       bulky and a waste of ressources.
       
       Since I can not estimate how secure this setup is, I do not recommend
       running this as a public service that allows access to untrusted people.
       
       I consider this setup experimental and unsecure. I am glad for every
       critical opinion on this.
       
       Here is the section for your /etc/ssh/sshd_config which forces the user
       into the read-only tmux-session:
       
             Match User viewer
                     AllowAgentForwarding no
                     AllowTcpForwarding no
                     GatewayPorts no
                     X11Forwarding no
                     PermitTunnel no
                     X11UseLocalhost no
                     PermitTTY yes
                     ForceCommand tmux a -r -t viewer; exit
       
       Afterwards you only need to nest the viewer-session into a tmux-session
       controlled by the presenter.
       
       For example:
             # wild nesting
             tmux new -s present
             su - viewer
             tmux a -t viewer
             su - $your_user
       
       Optional:
             # deactivate tmux-statusbar for the viewers
             tmux set -t viewer  status off
       
             # add viewercount for the presenter
             tmux set -t present status-right "Viewer: #(who | grep viewer -c)"
       
       I recommend to let people give you their pubkey so you can put it in
       /home/viewer/.ssh/authorized_keys
       
       This setup was inspired by the bitreich-con setup.
   DIR bitreich-con setup
       I used tmux over abduco and stripped away the audio portion.