[otrs] Fields available in OTRS_TICKET

I hope this isn't a common newbie question, but I can't find the answer in the docs... I am trying to customize the en::Customer::StateUpdate notification. In the documentation it says that has the options of the ticket data, but I can't find what the actual options are - are they listed somewhere? What I want is when I close a ticket, I want whatever I typed in the "Note Text" box to be included in the state change notification to the customer. I am also interested in including the full ticket history in the state email. Is there a way to do this? Thanks for the help! -Andrew