Settings are XML-controlled & No more HAL complications
Configuration information that was earlier stored in various text files find a new home under Vista: Unattend.txt, sysprep.inf, cmdlines.txt, and winbom.ini are now all replaced by a single XML file called unattend.xml.
You can still edit the file in question using a text editor of your choice, the Windows System Image Manager tool mentioned above can be used to inspect the Vista image to determine which settings are available for deployment, allowing you to configure each one.
Under Windows XP, different hardware abstraction layers called for multiple images to configure and deploy. You might have thus needed two or more images for a single platform; each additional image bringing added costs and complexity.
Windows Vista can now detect which HAL is required and can automatically install it–you are no longer forced to create iterations for different HALs.