I would like to know if there is a way to get
tmux to behave like
screen -D -R so I could say, have the command as a default command in Putty.
screen switches would force detach of an existing screen session for my user (even if it was still active and logged-in somewhere else) and reattach it to the current session. Also, in the case that no screen session existed, it would create a new one.
I like tmux and can see clear benefits over screen, but the existence of this feature would really seal the deal.
tmux attach doesn't seem to create a new session if there isn't one.
The man page for tmux says:
If no server is started, attach-session (attach) will attempt to start it; this will fail unless sessions are created in the configuration file.
I'm not sure exactly what the section in bold means: I can't find an example of creating a session in the conf file.