Change X11 window title after emacs started

Question

When I start emacs, I can use the --title= option to control the title of the x-window that holds the emacs application. Is it possible to change the title after emacs starts from elisp?

Answer 1

M-x set-frame-name NewName RET

and from elisp

(set-frame-name "NewName")

Answer 2

I use

(setq frame-title-format "%b - emacs")

to include the current buffer name in the frame title.