Just check the scripts, if vBulletin fetches data from the database it will normally have the column as the array key for that piece of data (if it is in an array). When vBulletin is setting data it normally uses the column names as the value for the HTML name="..." attribute on the form inputs.
You just have to look around and see what is going on. You could also just set up a test installation and check out the contents of the database, once you know what data is stored just find the corresponding data which is displayed.
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