Are you looking for a handy reference to all things Bigcommerce?
Then you came to the right place. Elena put together a Bigcommerce cheatsheet that lists the pages in Bigcommerce and the template files that they reference. It is very handy especially when trying to modify the design. She also put on there a bunch of helpful information in regards to the affiliate variables on the finishorder.php page, the global design variables etc.
It is a must grab, so download it below (free of charge). All we ask is that you spread the word!
or grab it via SlideShare:
Then search our Bigcommerce Variable List app for the exact global variable that you are looking for.