@c This is part of the Emacs manual.
@c Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1997, 2000, 2001,
-@c 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+@c 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
@c See file emacs.texi for copying conditions.
@node Windows, Frames, Buffers, Top
@chapter Multiple Windows
your click.
@vindex truncate-partial-width-windows
- When a window is less than the full width, text lines too long to
-fit are frequent. Continuing all those lines might be confusing, so
-if the variable @code{truncate-partial-width-windows} is
-non-@code{nil}, that forces truncation in all windows less than the
-full width of the screen, independent of the buffer being displayed
-and its value for @code{truncate-lines}. @xref{Line Truncation}.
+ 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}.
@xref{Visiting}.
@end table
+@vindex split-height-threshold
+@vindex split-width-threshold
+ By default, these commands split the window vertically when there is
+only one. You can customize the variables @code{split-height-threshold}
+and @code{split-width-threshold} to split the window horizontally
+instead.
+
+
@node Force Same Window
@section Forcing Display in the Same Window