Function: split-window-vertically
split-window-vertically is a and interactive for
split-window-below, defined in window.el.gz.
Signature
(split-window-vertically &optional SIZE)
Documentation
Split the selected window into two windows, one above the other.
The selected window is above. The newly split-off window is below and displays the same buffer. Return the new window.
If optional argument SIZE is omitted or nil, both windows get the
same height, or close to it. If SIZE is positive, the upper
(selected) window gets SIZE lines. If SIZE is negative, the
lower (new) window gets -SIZE lines.
If the variable split-window-keep-point is non-nil, both
windows get the same value of point as the selected window.
Otherwise, the window starts are chosen so as to minimize the
amount of redisplay; this is convenient on slow terminals.
Probably introduced at or before Emacs version 15.
Key Bindings