http://emacs.stackexchange.com/questions/9341/how-to-update-frame-title-format-and-also-the-current-frame-title

http://emacs.stackexchange.com/questions/9341/how-to-update-frame-title-format-and-also-the-current-frame-title

In general way, force-mode-line-update is used for frame title updating.

(setq my-project-name "project B")
(force-mode-line-update)
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