Use this command to connect to mud, or show sessions already on.
example:
      #session {temp} {123.45.67.89 6666}
This command will connect to 123.45.67.89 6666 with session_id "temp".
Later if in any case session "temp" is not on the top, use #temp
to bring it back.
So it is recommended that do not use numbers as session_id since it
conflicts with tintin's repeat command.
When port is set to 0, instead of make a real connection,
tintin++ create a dummy session connects to nowhere. This session is useful
to keep auto-login, a feature lacked from tintin for long. In this case,
the port field will be the 1st message shown when the dummy session was
created.