** Frame-local variables.<BR>
You can now make a variable local to various frames.  To do this, call
the function make-variable-frame-local; this enables frames to have
local bindings for that variable.
<P>
These frame-local bindings are actually frame parameters: you create a
frame-local binding in a specific frame by calling
modify-frame-parameters and specifying the variable name as the
parameter name.
<P>
Buffer-local bindings take precedence over frame-local bindings.
Thus, if the current buffer has a buffer-local binding, that binding is
active; otherwise, if the selected frame has a frame-local binding,
that binding is active; otherwise, the default binding is active.
<P>
It would not be hard to implement window-local bindings, but it is not
clear that this would be very useful; windows tend to come and go in a
very transitory fashion, so that trying to produce any specific effect
through a window-local binding would not be very robust.
<P>