Index: /trunk/include/set_cash_cookie_path.php
===================================================================
--- /trunk/include/set_cash_cookie_path.php	(revision 210)
+++ /trunk/include/set_cash_cookie_path.php	(revision 211)
@@ -66,3 +66,11 @@
 	define( 'ADMIN_COOKIE_PATH', SITECOOKIEPATH);
 
+/**
+ * It is possible to define this in wp-config.php
+ * @since 2.0.0
+ */
+if ( !defined('COOKIE_DOMAIN') )
+	define('COOKIE_DOMAIN', false);
+
+
 ?>