This video is about changing a worker node to a gateway node and changing a gateway node to a worker node. You can make changes at the command line as well as in the Administrator console. It is fun and easy!
Converting and adding of a self signed certificate to use a Webservice Consumer transformation
How to unassign services from an expired key and assign them to a valid key in 9.1.0 and 9.5.1
How to find in which host the Repository Integration service is running in a multi node domain