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The Ctrl-X 2 command splits the current window into two windows, one on
top of the other, each about half as large. Each window displays the
same buffer that the original did. This command will only split the
window if each new window would occupy at least 1 screen line, not
counting the mode line. To edit another file in a new window, first
use Ctrl-X 2, then use one of the file commands described in Reading Files.
The Ctrl-X 5 command works similarly, but splits the current window so
that the two child windows appear side by side, instead of stacked.
This command will only split the window if each new window would
occupy at least 1 column. Since this typically results in narrow
windows, the Ctrl-X 5 command also sets up the windows to scroll long
lines, as described in Horizontal Scrolling. See the
wrap-split-vertically variable to control this.
When you display the same buffer in several narrow
windows side by side, follow mode can be useful. It operates when the
same buffer is displayed in adjacent windows, by linking the windows
together so scrolling and other movement in one is immediately
reflected in the others. The follow-mode command toggles this
mode for the current buffer. The follow-mode-overlap variable
controls how much the window text overlaps.
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