+@node Configuring Scrolling, Replace, Search Case, Search
+@section Configuring Scrolling
+@cindex scrolling in incremental search
+@vindex isearch-allow-scroll
+
+Scrolling, etc., during incremental search is enabled by setting the
+customizable variable @code{isearch-allow-scroll} to a non-nil value.
+
+@c See Subject: Info file: How do I get an itemized list without blank lines?
+@c Date: Sat, 12 Apr 2003 09:45:31 +0000 in gnu.emacs.help
+@subsection Standard scrolling commands
+Here is the list of commands which are configured by default to be
+``scrolling'' commands in an incremental search, together with their
+usual bindings:
+@subsubsection Commands which scroll the window:
+@table @asis
+@item @code{scroll-bar-toolkit-scroll} (@kbd{@key{vertical-scroll-bar}@key{mouse-1}} in X-Windows)
+@itemx @code{mac-handle-scroll-bar-event} (@kbd{@key{vertical-scroll-bar}@key{mouse-1}} on a Mac)
+@itemx @code{w32-handle-scroll-bar-event} (@kbd{@key{vertical-scroll-bar}@key{mouse-1}} in MS-Windows)
+@item @code{recenter} (@kbd{C-l}) @xref{Scrolling}.
+@itemx @code{reposition-window} (@kbd{C-M-l}) @xref{Scrolling}.
+@itemx @code{scroll-up} (@kbd{@key{NEXT}}) @xref{Scrolling}.
+@itemx @code{scroll-down} (@kbd{@key{PRIOR}}) @xref{Scrolling}.
+@end table
+
+@subsubsection Commands which act on the other window:
+@table @asis
+@item @code{list-buffers} (@kbd{C-x C-b}) @xref{List Buffers}.
+@itemx @code{scroll-other-window} (@kbd{C-M-v}) @xref{Other Window}.
+@itemx @code{scroll-other-window-down} (@kbd{C-M-S-v}) @xref{Other Window}.
+@itemx @code{beginning-of-buffer-other-window} (@kbd{M-@key{home}})
+@itemx @code{end-of-buffer-other-window} (@kbd{M-@key{end}})
+@end table
+
+@subsubsection Commands which change the window layout:
+@table @asis
+@item @code{delete-other-windows} (@kbd{C-x 1}) @xref{Change Window}.
+@itemx @code{balance-windows} (@kbd{C-x +}) @xref{Change Window}.
+@itemx @code{split-window-vertically} (@kbd{C-x 2}) @xref{Split Window}.
+@itemx @code{enlarge-window} (@kbd{C-x ^}) @xref{Change Window}.
+@end table
+
+@subsection Configuring other commands as scrolling commands
+To do this, set a command's isearch-scroll property to the value t.
+For example:
+
+@example
+@code{(put 'my-command 'isearch-scroll t)}
+@end example
+
+You should only thus configure commands which are ``safe'': i.e., they
+won't leave emacs in an inconsistent state when executed within a
+search - that is to say, the following things may be changed by a
+command only temporarily, and must be restored before the command
+finishes:
+
+@enumerate
+@item
+Point.
+@item
+The buffer contents.
+@item
+The selected window and selected frame.
+@item
+The current match-data @xref{Match Data,,,elisp}.
+@end enumerate
+
+Additionally, the command must not delete the current window and must
+not itself attempt an incremental search. It may, however, change the
+window's size, or create or delete other windows and frames.
+
+Note that an attempt by a command to scroll the text
+@emph{horizontally} won't work, although it will do no harm - any such
+scrolling will be overriden and nullified by the display code.
+
+@node Replace, Other Repeating Search, Configuring Scrolling, Search