(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. (1997-02-27)