Uniqueness Database File
In Microsoft Windows system administration, a Uniqueness Database File (UDF) is a text file that enables the administrator to supply the information that must be unique to each computer or each user. Used in conjunction with a single answer file, when Windows XP Professional is deployed to several client computers that require different setup configurations.
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uniqueness database file (UDF) A text file that is used in conjunction with an answer file and contains the settings that are unique to each computer.
/udf:id[,UDF_ file] Indicates an identifier (id) that Setup uses to specify how a uniqueness database file (UDF) modifies an answer file. The /udf parameter overrides values in the answer file, and the identifier determines which values in the UDF file are used. If you do not specify a UDF_ file, Setup prompts you to insert a disk that contains the $UNIQUE$.UDB file. Also refer to [ANSWER FILE].