Unlike devices such as printers and hard disk drives, audio devices do not have to be shareable between applications running in Windows enhanced mode. However, if applications exist (or will exist in the future) that access your audio hardware directly, you should write a VxD to prevent these applications from doing so while Windows is using the device. For an example VxD, see the Sound Blaster sample device driver called VSBD. For more information on how to write a VxD, see the Windows Virtual Device Adaptation Guide.