- When a window occupies less than the full width of the frame, it may
-become too narrow for most of the text lines in its buffer. If most of
-its lines are continued (@pxref{Continuation Lines}), the buffer may
-become difficult to read. Therefore, Emacs automatically truncates
-lines if the window width becomes narrower than 50 columns. This
-truncation occurs regardless of the value of the variable
-@code{truncate-lines} (@pxref{Line Truncation}); it is instead
-controlled by the variable @code{truncate-partial-width-windows}. If
-the value of @code{truncate-partial-width-windows} is a positive integer
-(the default is 50), that specifies the minimum width for a
-partial-width window before automatic line truncation occurs; if the
-value is @code{nil}, automatic line truncation is disabled; and for any
-other non-@code{nil} value, Emacs truncates lines in every partial-width
-window regardless of its width.
-
- Horizontal scrolling is often used in side-by-side windows.
-@xref{Horizontal Scrolling}.
-
-@vindex split-window-keep-point
- If @code{split-window-keep-point} is non-@code{nil}, the default,
-both of the windows resulting from @kbd{C-x 2} inherit the value of
-point from the window that was split. This means that scrolling is
-inevitable. If this variable is @code{nil}, then @kbd{C-x 2} tries to
-avoid scrolling the text currently visible on the screen, by putting
-point in each window at a position already visible in the window. It
-also selects whichever window contains the screen line that the cursor
-was previously on. Some users prefer that mode on slow terminals.
+ When you split a window with @kbd{C-x 3}, each resulting window
+occupies less than the full width of the frame. If it becomes too
+narrow, the buffer may be difficult to read if continuation lines are
+in use (@pxref{Continuation Lines}). Therefore, Emacs automatically
+switches to line truncation if the window width becomes narrower than
+50 columns. This truncation occurs regardless of the value of the
+variable @code{truncate-lines} (@pxref{Line Truncation}); it is
+instead controlled by the variable
+@code{truncate-partial-width-windows}. If the value of this variable
+is a positive integer (the default is 50), that specifies the minimum
+width for a partial-width window before automatic line truncation
+occurs; if the value is @code{nil}, automatic line truncation is
+disabled; and for any other non-@code{nil} value, Emacs truncates
+lines in every partial-width window regardless of its width.
+
+ On text terminals, side-by-side windows are separated by a vertical
+divider which is drawn using the @code{vertical-border} face.
+
+@kindex C-Mouse-2 @r{(mode line)}
+@kindex C-Mouse-2 @r{(scroll bar)}
+ If you click @kbd{C-Mouse-2} in the mode line of a window, that
+splits the window, putting a vertical divider where you click.
+Depending on how Emacs is compiled, you can also split a window by
+clicking @kbd{C-Mouse-2} in the scroll bar, which puts a horizontal
+divider where you click (this feature does not work when Emacs uses
+GTK+ scroll bars).
+
+@vindex window-resize-pixelwise
+ By default, when you split a window, Emacs gives each of the
+resulting windows dimensions that are an integral multiple of the
+default font size of the frame. That might subdivide the screen
+estate unevenly between the resulting windows. If you set the
+variable @code{window-resize-pixelwise} to a non-@code{nil} value,
+Emacs will give each window the same number of pixels (give or take
+one pixel if the initial dimension was an odd number of pixels). Note
+that when a frame's pixel size is not a multiple of the frame's
+character size, at least one window may get resized pixelwise even if
+this option is @code{nil}.