>
> > I often translate information from english to spanish, when I do that
> > always use two window to do my work,
>
> M-x scroll-all-mode RET
>

Nice. I forgot about that one.

When I need this I usually record a keyboard macro that scrolls one window
down, switch to the other window and scroll that down and then switch back
to the first window. scroll-all-mode is of course much easier to use but
maybe the macro trick can solve similar problems.

/Mathias