Display same file successive pages on Emacs split screen

Question

I've done this before, years ago, so I know the answer is out there. However the google-space is heavily polluted with namespace collisions, especially new user guides.

This is what I'd like to do in Emacs 21:

Split the screen on a given file buffer (C-x 3). As I page through the first screen (C-v), the next page of the file is automatically displayed on the second.

To be clear, the next line in the file after the last line on the left screen should be the first line on the right screen, always.

Any help?

Answer 1

You want scroll-all-mode

scroll-all-mode is an interactive compiled Lisp function in `scroll-all.el'.
(scroll-all-mode &optional arg)

Toggle Scroll-All minor mode.
With arg, turn Scroll-All minor mode on if arg is positive, off otherwise.
When Scroll-All mode is on, scrolling commands entered in one window
apply to all visible windows in the same frame.

Set up the windows appropriately, and then turn on scroll-all-mode, and from then on all windows scroll together

Answer 2

This question appears to be a duplicate: http://stackoverflow.com/questions/970292/emacs-multiple-columns-one-buffer

Answer 3

You might be looking for follow-mode

It is minor mode that combines windows into one tall virtual window.

Answer 4

If follow-mode doesn't work, you could define your own macro, something like

(defun align-windows ()
  (set-window-start (other-window) (window-start))
  (scroll-other-window))

Then either use this (along with scroll-down) instead of C-v, or rebind C-v to that, or add advice to scroll-down.