Shad,
The system only knows that it has a specific set of "things". It has no idea if those things are being used or not. It has no idea what those things are wired for. You have to know how your system is wired and what each "thing" is wired to do.
As an example... Let's say you have Aux 1 wired so that it turns on a pool light. The system only knows that it has a Circuit called Aux 1. You can leave the Circuit Name as Aux 1, but then you have to remember what Aux 1 does.. So, it makes sense to rename Aux 1 "Pool Light". The Circuit Name is just what you call it.. The system does not care what you call it.. You could name it "Upside down cake" if you wanted.. The system will just turn on the Aux 1 Circuit, no matter what you call it.
Normally the system does not know what Aux 1 does.. It just turns on Aux 1 when you tell it to turn on Aux 1. The Circuit Function tells the system that the Circuit is special. Most of the time it is best to leave the Circuit Function as Generic.. But as you have seen with the lights, if you tell the system that the Circuit is for an IntelliBrite, then the system knows to act a certain way so it can control the light.
Thanks,
Jim R.