Application_Modifier action element is used to
modify context variables and remove session data values at runtime in a voice
application. It allows for a developer to change the application’s environment
anywhere in the callflow. A typical use for the Application_Modifier element
would be for multi-language support because it can be used to change the
application level xml:lang and encoding values.
Visiting an Application_Modifier element instance will update the application
for the current session