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(elisp)Frame Titles

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Frame Titles
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   Every frame has a `name' parameter; this serves as the default for
the frame title which window systems typically display at the top of
the frame.  You can specify a name explicitly by setting the `name'
frame property.

   Normally you don't specify the name explicitly, and Emacs computes
the frame name automatically based on a template stored in the variable
`frame-title-format'.  Emacs recomputes the name each time the frame is
redisplayed.

 - Variable: frame-title-format
     This variable specifies how to compute a name for a frame when you
     have not explicitly specified one.  The variable's value is
     actually a mode line construct, just like `mode-line-format'.
     Note: Mode Line Data.

 - Variable: icon-title-format
     This variable specifies how to compute the name for an iconified
     frame, when you have not explicitly specified the frame title.
     This title appears in the icon itself.

 - Variable: multiple-frames
     This variable is set automatically by Emacs.  Its value is `t' when
     there are two or more frames (not counting minibuffer-only frames
     or invisible frames).  The default value of `frame-title-format'
     uses `multiple-frames' so as to put the buffer name in the frame
     title only when there is more than one frame.