tmux distinguishes between names and titles. Windows and sessions
have names, which may be used to specify them in targets and are
displayed in the status line and various lists: the name is the
tmux identifier for a window or session. Only panes have titles.
A pane's title is typically set by the program running inside the
pane using an escape sequence (like it would set the xterm(1)
window title in X(7)). Windows themselves do not have titles - a
window's title is the title of its active pane. tmux itself may
set the title of the terminal in which the client is running, see
the set-titles option.
A session's name is set with the new-session and rename-session
commands. A window's name is set with one of:
1. A command argument (such as -n for new-window or
new-session).
2. An escape sequence (if the allow-rename option is turned
on):
$ printf '\033kWINDOW_NAME\033\\'
3. Automatic renaming, which sets the name to the active
command in the window's active pane. See the
automatic-rename option.
When a pane is first created, its title is the hostname. A pane's
title can be set via the title setting escape sequence, for
example:
$ printf '\033]2;My Title\033\\'
It can also be modified with the select-pane -T command.
