|  | Performing an Automated Installation Using a UDF During Setup
For example, to run a UDF for winnt32, type: winnt32 /unattend:unattend.txt /udf:computer1,unattend.udf If both the unique ID and the UDF name are specified, the UDF is copied during text-mode Setup to the local drive of the target computer. The UDF is then used during GUI-mode Setup without user intervention. If only the unique ID is specified on the winnt or winnt32 command line, Setup requires a 3.5-inch disk containing a UDF named $Unique$.udf. This disk must be prepared and given to the user before the automated setup is initiated. The user will be prompted for this disk during GUI-mode Setup. If the supplied UDF is damaged, or if Setup cannot locate the specified unique ID in it, the user is prompted to either insert a 3.5-inch disk with the repaired UDF or to exit Setup. If the user clicks Cancel, the answer file values are used and the UDF values are ignored.
| Note: When you are using an answer file and UDF to install Windows XP Professional on a computer without an operating system, you will need to specify the unique ID for the correct computer name when running the winnt32 command. The syntax is: /udf:computer name.