The trigger concept is used to handle locking situations, allow asynchronous updates and separation of concerns.
This concept and the report to process this triggers are explained in this episode.
The consulting notes mentioned are:
1. For trigger concept mentioned in the podcast is 1747234
2. TM Super Authorization: 1909959
The Application Operations Guide can be found here (for 9.0):
All information provided by this podcast is based on our best knowledge. However there can be wrong information or things can be changed.