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. See section 23.3.1 The Data Structure of the Mode Line.
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.
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