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(efaq)Displaying the current file name in the titlebar

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How can I modify the titlebar to contain the current file name?
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   The contents of an Emacs frame's titlebar is controlled by the
variable `frame-title-format', which has the same structure as the
variable `mode-line-format'.  (Use `C-h v' or `M-x describe-variable'
to get information about one or both of these variables.)

   By default, the titlebar for a frame does contain the name of the
buffer currently being visited, except if there is a single frame.  In
such a case, the titlebar contains Emacs invocation name and the name
of the machine at which Emacs was invoked.  This is done by setting
`frame-title-format' to the default value of

     (multiple-frames "%b" ("" invocation-name "@" system-name))

   To modify the behavior such that frame titlebars contain the buffer's
name regardless of the number of existing frames, include the following
in your `.emacs':

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