While you're waiting for a definitive answer from Webassist, in Dreamweaver you can press Ctrl-F for find and replace,
Find in: to Entire Local Site
Search: Source Code
Find: whatever variable your are searching for
And click Find Next
This will quickly identify every place in the entire site where that variable is used.
You will probably want to change it to hidden on the form and set it to US so it won't mess anything up.