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+;; Display a buffer in rot13.
+;; Copyright (C) 1988 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+;; Written by Howard Gayle.  See case-table.el for details.
+
+;; This hack is mainly to show off the char table stuff.
+
+(defvar rot13-display-table
+  (let ((table (make-display-table))
+	(i 0))
+    (while (< i 26)
+      (aset table (+ i ?a) (make-rope (+ (% (+ i 13) 26) ?a)))
+      (aset table (+ i ?A) (make-rope (+ (% (+ i 13) 26) ?A)))
+      (setq i (1+ i)))
+    table)
+  "Char table for rot 13 display.")
+
+(defun rot13-other-window ()
+  "Display current buffer in rot 13 in another window."
+  (interactive)
+  (let ((w (display-buffer (current-buffer) t)))
+    (set-window-display-table w rot13-display-table)))
+
+(provide 'rot13)