As part of the operating system, Windows Vista provides a bus driver for managing the Intel High Definition Audio (HD Audio) bus interface controller, as well as a Universal Audio Architecture (UAA) class driver for managing a UAA-compliant audio codec that is connected to an HD Audio controller.
Get all the details about the HD Audio Device Driver Interface (DDI) here:
http://msdn2.microsoft.com/en-us/library/ms790041.aspx
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