scroll-all-mode
scroll-all-mode is an interactive autoloaded compiled Lisp function in `scroll-all.el
'.
(scroll-all-mode &optional ARG)
Toggle shared scrolling in same-frame windows (Scroll-All mode).
With a prefix argument ARG, enable Scroll-All mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.
When Scroll-All mode is enabled, scrolling commands invoked in
one window apply to all visible windows in the same frame.