Virtual Device Driver


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Virtual Device Driver

(operating system)
(VxD) A device driver under Windows 3.x/Windows 95 running as part of the kernel and thus having access to the memory of the kernel and all running processes as well as raw access to the hardware. VxD's usually have the filename extension .386 under Windows 3.x and .vxd under Windows 95. VxD's written for Windows 3.x can be used under Windows 95 but not vice versa.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

VxD

(Virtual Device Driver) A special type of Windows driver that allows Windows to perform functions that cannot be done by applications communicating with Windows in the normal manner. VxDs run at the most privileged CPU mode (ring 0) and allow low-level interaction with the hardware and internal Windows functions, such as memory management. For example, the operating system kernel is a VxD. See kernel.
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