Context plays an important role when it comes to parent-child pipeline execution and this is now better explained in latest SDK release (4.0.8) other highlights are a new walkthrough: Server to Server Authentication with CRM Online
Download http://www.microsoft.com/downloads/details.aspx?FamilyID=82E632A7-FAF9-41E0-8EC1-A2662AAE9DFB&displaylang=en 
Online version http://msdn.microsoft.com/en-us/library/cc151083.aspx