Behaves as control when used in conjunction with other keys.
Behaves as escape when used alone. When accidentally pressed
keep long pressing (>500ms) and it will pretend to not have
been pressed.
If a session is running, run a detached session. (Detach
all other clients.) If no session with the name is
running, create a new session and attach. Session name
can be passed in, or defaults to current directory name.
