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### 5.6 How can I modify the titlebar to contain the current file name?

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")