User Activity

So I had difficulty finding this feature that Vahe demonstrated at Pantheon. I am sure they will have a knowledge base out soon, but for those of us who have trouble waiting here is a brief rundown on how to activate it. ST Chat Help was fantastic in...
We have a couple of different invoice types, but I am wondering why. What are the best practices and why? The only thing I could find was the ability to run an AR report based on invoice type. Is there a way to create an Invoice type default?