Open up your SharePoint List in the browser, and then filter your list based on one of the fields you aren't sure of the name for - the URL will contain the correct field name (but may just URL encode some special chars).
Another excellent tool is the U2U CAML query editor - you can find it for free here.
Oh, and I adore this online URL decoder / encoder as well.
Hopefully if someone else knows of a reference, s/he will chime in.