bug#2554: 23.0.90; How to set default ispell dictionary isn't documented?

I only use ispell for German, so it's inconvenient to use 'M-x 
ispell-change-dictionary <RET> DICT <RET>' every time.

The manual (info "(emacs)Spelling") doesn't explain how to set default 
ispell dictionary ('ispell-dictionary'?) for all buffers / for every Emacs 
session.


In GNU Emacs 23.0.90.1 (i386-mingw-nt6.0.6001)
 of 2009-02-01 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 6.0.6001
configured using `configure --with-gcc (3.4)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: DEU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  recentf-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <menu-bar>
<help-menu> <send-emacs-bug-report>

Recent messages:
Loading recentf...done
Loading e:/Emacs-Home/.recentf...done
Cleaning up the recentf list...done (0 removed)
Loading 
e:/Emacs-Home/my-lisp/color-theme-6.6.0/Themes/color-theme-example.el 
(source)...done
Loading 
e:/Emacs-Home/my-lisp/color-theme-6.6.0/Themes/color-theme-library.el 
(source)...done
Loading 
e:/Emacs-Home/my-lisp/color-theme-6.6.0/Themes/color-theme-library.el~...done
For information about GNU Emacs and the GNU system, type C-h C-a.

Greetings - Joachim Reiter, Germany