The mechanisms and techniques described in this document are directed to a journal that allows a navigation-based application to store and restore state of a resource that is programmatically altered. A resource may invoke code that creates and stores an entry in the journal. The entry includes sufficient...http://www.google.com/patents/US7246130?utm_source=gb-gplus-sharePatent US7246130 - Journalling non-navigation activity in a navigation-based application
