Response UDM now provides you a mechanism to transfer control in a generated application, from one page to another or to an external URI.
  In the process of creating a custom UDM, after specifying the UDM name, click on the Create button. It opens up a page on the UDM details. Under UDM submission, click on Edit button. This opens up an interface to edit the UDM response. A drop down list appears, the last option of which is " External URI". Select this and click on the "Next" Button. A dialog box opens up where you can specify the complete response URI, which can either be a UDM or an external URL (for e.g., http://www.yahoo.com). Click on the save button.
  This feature enables you to acquire access to a URL external to the zDE environment. You can also use the ?n? notation to pass any node parameters (say, a node id) of any UDM which will redirect you to the page with the corresponding node id.