@itemize @bullet
@item
The @code{push} and @code{pop} macros are not defined.
+Neither are @code{dolist} and @code{dotimes}.
@item
You can't display images in buffers. (Emacs is meant for editing text.)
text cursor, and the mouse cursor. To specify menu colors, use X
resources.
+@item
+Colors and other face attributes are no longer supported on character
+terminals, so you no longer have to worry about terminals making faces
+at you.
+
@item
Emacs will respect your peace and quiet, aside from occasional beeps,
because there are no facilities for playing sounds.
+@item
+Emacs 20 provides a complex and badly designed method for handling
+character composition for languages such as Thai that display several
+letters as a single combined image. We are too ashamed of it to tell
+you any more than that.
+
+@item
+@code{delete-and-extract-region} has been deleted; instead, use
+@code{buffer-substring} to extract the text, then use
+@code{delete-region} to delete it.
+
@item
Regular expressions do not support the POSIX character classes
such as @samp{[:alpha:]}. All characters are created equal.
(Certain characters, such as Chinese characters, always have twice
the standard width.) All characters are created equal.
+@item
+You can now resize any Emacs window, and size changes in one window can
+propagate to all others. Windows can no longer use
+@code{window-size-fixed} to get special privileges.
+
+@item
+The function @code{intern-soft} no longer accepts a symbol as argument.
+
@item
The function @code{bitmap-spec-p} has been renamed to
@code{pixmap-spec-p} to encourage users to practice Emacs' help system
The functions @code{format} and @code{message} ignore and discard text
properties.
+@item
+The function @code{propertize} does not exist;
+you can get the job done using @code{set-text-properties}.
+
@item
Colors are supported only on window systems, not on text-only terminals.
So the support functions for colors on text-only terminals are
and character's registry and encoding. If there is a font that matches
exactly, it is used, of course. The hard case is when no available font
exactly fits the specification. Then Emacs looks for one that is
-``close''---one attribute at a time. You can specify the order
-to consider the attributes.
+``close''---one attribute at a time. You can specify the order to
+consider the attributes. In the case where a specified font family is
+not available, you can specify a set of mappings for alternatives to
+try.
@defvar face-font-selection-order
@tindex face-font-selection-order
false for text-only terminals.
@end defun
+@defun display-mouse-p &optional display
+@tindex display-mouse-p
+@cindex mouse, availability
+This function returns @code{t} if @var{display} has a mouse available,
+@code{nil} if not.
+@end defun
+
@defun display-color-p &optional display
@tindex display-color-p
@findex x-display-color-p
@defun display-grayscale-p &optional display
@tindex display-grayscale-p
This function returns @code{t} if the screen can display shades of gray.
+(All color displays can do this.)
@end defun
@defun display-selections-p &optional display
@defun display-backing-store &optional display
@tindex display-backing-store
-This function returns the backing store capability of the screen.
+This function returns the backing store capability of the display.
+Backing store means recording the pixels of windows (and parts of
+windows) that are not exposed, so that when exposed they can be
+displayed very quickly.
+
Values can be the symbols @code{always}, @code{when-mapped}, or
@code{not-useful}. The function can also return @code{nil}
when the question is inapplicable to a certain kind of display.
@defun display-save-under &optional display
@tindex display-save-under
This function returns non-@code{nil} if the display supports the
-SaveUnder feature.
+SaveUnder feature. That feature is used by pop-up windows
+to save the pixels they obscure, so that they can pop down
+quickly.
@end defun
@defun display-planes &optional display
@tindex display-planes
This function returns the number of planes the display supports.
+This is typically the number of bits per pixel.
@end defun
@defun display-visual-class &optional display
@end deffn
@deffn Command delete-region start end
-This command deletes the text in the current buffer in the region
-defined by @var{start} and @var{end}. The value is @code{nil}. If
-point was inside the deleted region, its value afterward is @var{start}.
+This command deletes the text between positions @var{start} and
+@var{end} in the current buffer, and returns @code{nil}. If point was
+inside the deleted region, its value afterward is @var{start}.
Otherwise, point relocates with the surrounding text, as markers do.
@end deffn
+@defun delete-and-extract-region start end
+@tindex delete-and-extract-region
+This function deletes the text between positions @var{start} and
+@var{end} in the current buffer, and returns a string containing the
+text just deleted.
+
+If point was inside the deleted region, its value afterward is
+@var{start}. Otherwise, point relocates with the surrounding text, as
+markers do.
+@end defun
+
@deffn Command delete-char count &optional killp
This command deletes @var{count} characters directly after point, or
before point if @var{count} is negative. If @var{killp} is
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