Follow Mode
Follow mode is a minor mode that makes two windows showing the
same buffer scroll as one tall "virtual window." To use Follow mode,
go to a frame with just one window, split it into two side-by-side
windows using C-x 3, and then type M-x follow-mode. From
then on, you can edit the buffer in either of the two windows, or scroll
either one; the other window follows it.
In Follow mode, if you move point outside the portion visible in one
window and into the portion visible in the other window, that selects
the other window--again, treating the two as if they were parts of
one large window.
To turn off Follow mode, type M-x follow-mode a second time.
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