Index: /CKEditor/branches/versions/3.4.x/_source/plugins/tab/plugin.js
===================================================================
--- /CKEditor/branches/versions/3.4.x/_source/plugins/tab/plugin.js	(revision 5789)
+++ /CKEditor/branches/versions/3.4.x/_source/plugins/tab/plugin.js	(revision 5790)
@@ -360,6 +360,8 @@
  */
 
-CKEDITOR.config.keystrokes.push(
-	[ CKEDITOR.ALT + 38 /*Arrow Up*/, 'selectPreviousCell' ],
-	[ CKEDITOR.ALT + 40 /*Arrow Down*/, 'selectNextCell' ]
-);
+// If the TAB key is not supposed to be enabled for navigation, the following
+// settings could be used alternatively:
+// config.keystrokes.push(
+//	[ CKEDITOR.ALT + 38 /*Arrow Up*/, 'selectPreviousCell' ],
+//	[ CKEDITOR.ALT + 40 /*Arrow Down*/, 'selectNextCell' ]
+// );