In v10 just like 9.x, when you create an address locator, you pick the fields from the reference database that match the address locator elements. In v10, at the bottom of the field selections, there is the option to select an additional (L and R if using Dual Range Style) field from the reference database that will be output with the matched results.
For my projects, I choose the unique identifier in the reference database as the additional field. This way, I can look at my results and link each matched result back to the candidate it matched to in the reference database because the unique identifier value is listed as the User_fld.
