tmux
It is suggested to give a Session a Unique name.
This will allow this specific Session to be referred to in later commands.
tmux new -s a_session_name
displays:
sessions should be nested with care, unset $TMUX to force
NOTE: tmux does support Nested sessions, but this adds complexity.
For instance to create a new Window within a specific session, an additional b is needed:
<CTRL-b> + b + c