If you select Prefer User Dictionary Matches, candidates from the User Dictionary are given a higher score than a similar candidate from the GSD. The GS_FIND_DB_ORDER property is designed for situations where you feel that your User Dictionary is superior to the GSD, and therefore you prefer matches from the User Dictionary over matches from the GSD whenever possible.
GeoStan supports the creation and use of User Dictionaries based on your own source data. A User Dictionary can be used independently or as a supplement to the supplied GSD.
You can geocode using:
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User Dictionary (or multiple User Dictionaries) alone.
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Standard GSD.
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A combination of GSD and User Dictionaries
The results from a User Dictionary are similar to that from the GSD. For address matches where the first letter of the match code would be 'S', a User Dictionary match has the letter 'J'. The value of the GS_REC_TYPE is 'U'. Also, the enum GS_DATATYPE returns a new value for the User Dictionary record matches, see User Dictionary (GsFileStatusEx) for more information.
For example: SE9 is a match code for a match that comes from a GSD, while JE9 is for a match that comes from a User Dictionary. See Status codes for a complete description of match codes.