with a temporary buffer as the current buffer. It saves the identity of
the current buffer, creates a temporary buffer and makes it current,
evaluates the @var{body} forms, and finally restores the previous
-current buffer while killing the temporary buffer.
+current buffer while killing the temporary buffer. By default, undo
+information (@pxref{Undo}) is not recorded in the buffer created by
+this macro (but @var{body} can enable that, if needed).
The return value is the value of the last form in @var{body}. You can
return the contents of the temporary buffer by using
Any argument called @var{buffer} must be an actual buffer
object, not a name.
+@cindex hidden buffers
+@cindex buffers without undo information
Buffers that are ephemeral and generally uninteresting to the user
have names starting with a space, so that the @code{list-buffers} and
@code{buffer-menu} commands don't mention them (but if such a buffer
use.
If @var{filename} is @code{nil} or the empty string, that stands for
-``no visited file''. In this case, @code{set-visited-file-name} marks
+``no visited file.'' In this case, @code{set-visited-file-name} marks
the buffer as having no visited file, without changing the buffer's
modified flag.
@end example
The major mode for a newly created buffer is set to Fundamental mode.
-The variable @code{default-major-mode} is handled at a higher level.
-@xref{Auto Major Mode}.
+(The variable @code{default-major-mode} is handled at a higher level;
+see @ref{Auto Major Mode}.) If the name begins with a space, the
+buffer initially disables undo information recording (@pxref{Undo}).
@end defun
@defun generate-new-buffer name