=== modified file 'lisp/icomplete.el'
--- lisp/icomplete.el	2013-02-08 07:53:55 +0000
+++ lisp/icomplete.el	2013-02-13 14:24:14 +0000
@@ -156,8 +156,8 @@ except those on this list.")
   (let ((map (make-sparse-keymap)))
     (define-key map [?\M-\t] 'minibuffer-force-complete)
     (define-key map [?\C-j]  'minibuffer-force-complete-and-exit)
-    (define-key map [?\C-s]  'icomplete-forward-completions)
-    (define-key map [?\C-r]  'icomplete-backward-completions)
+    (define-key map [?\C-.]  'icomplete-forward-completions)
+    (define-key map [?\C-,]  'icomplete-backward-completions)
     map))
 
 (defun icomplete-forward-completions ()

=== modified file 'lisp/ido.el'
--- lisp/ido.el	2013-01-02 16:13:04 +0000
+++ lisp/ido.el	2013-02-13 14:07:22 +0000
@@ -1585,6 +1585,8 @@ This function also adds a hook to the mi
     (define-key map "\C-p" 'ido-toggle-prefix)
     (define-key map "\C-r" 'ido-prev-match)
     (define-key map "\C-s" 'ido-next-match)
+    (define-key map [?\C-.] 'ido-next-match)
+    (define-key map [?\C-,] 'ido-prev-match)
     (define-key map "\C-t" 'ido-toggle-regexp)
     (define-key map "\C-z" 'ido-undo-merge-work-directory)
     (define-key map [(control ?\s)] 'ido-restrict-to-matches)

=== modified file 'lisp/iswitchb.el'
--- lisp/iswitchb.el	2013-01-01 09:11:05 +0000
+++ lisp/iswitchb.el	2013-02-13 14:07:06 +0000
@@ -471,6 +471,8 @@ interfere with other minibuffer usage.")
     (define-key map "?" 'iswitchb-completion-help)
     (define-key map "\C-s" 'iswitchb-next-match)
     (define-key map "\C-r" 'iswitchb-prev-match)
+    (define-key map [?\C-.] 'iswitchb-next-match)
+    (define-key map [?\C-,] 'iswitchb-prev-match)
     (define-key map "\t" 'iswitchb-complete)
     (define-key map "\C-j" 'iswitchb-select-buffer-text)
     (define-key map "\C-t" 'iswitchb-toggle-regexp)