|  | Creating a Uniqueness Database File Lesson Overview
You create a Uniqueness Database File (UDF) to replace values or provide additional values or sections in an answer file. Creating a UDF enables you to use one answer file for multiple client computers that require different setup configurations. Otherwise, you would need to create a separate answer file for each client computer. UDFs contain two sections. The first section specifies which sections of data will be replaced in or merged with the answer file. The second section provides the actual information to be replaced or merged. The sections in a UDF are specified in a text file similar to the way that they appear in an answer file. This UDF text file is indexed through strings called unique IDs. You must assign a unique ID to each computer that is part of the automated setup. However, more than one computer, such as all of the computers in a specific location, can use the same unique ID. The replacement sections are mapped to the unique IDs, and are then replaced in the answer file during the start of GUI-mode Setup. The Setup Manager Wizard creates UDF if multiple computer names are entered on the Computer Names page. The UDF that is automatically created contains only the unique IDs and the computer names that were entered into the Setup Manager Wizard when the answer file was created. If a more detailed or customized UDF is required, double-click the Unattend.udb file and use a text editor, such as Notepad, to edit the UDF. In this lesson you will learn about the following topics: Mapping unique IDs Configuring UDF settings