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(elisp)Header Lines

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Window Header Lines
-------------------

   Starting in Emacs 21, a window can have a "header line" at the top,
just as it can have a mode line at the bottom.  The header line feature
works just like the mode line feature, except that it's controlled by
different variables.

 - Variable: header-line-format
     This variable, local in every buffer, specifies how to display the
     header line, for windows displaying the buffer.  The format of the
     value is the same as for `mode-line-format' (Note: Mode Line
     Data).

 - Variable: default-header-line-format
     This variable holds the default `header-line-format' for buffers
     that do not override it.  This is the same as `(default-value
     'header-line-format)'.

     It is normally `nil', so that ordinary buffers have no header line.