If CONTROLLING-PROCESS is non-nil, it should be an integer
specifying the process id of the process in control of the specified tty. If
it is nil, it is assumes to be the value returned by emacs-pid."
If CONTROLLING-PROCESS is non-nil, it should be an integer
specifying the process id of the process in control of the specified tty. If
it is nil, it is assumes to be the value returned by emacs-pid."