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In Microsoft computing, a VxD is a virtual device driver. They run under the Windows 3.x, Windows 95, Windows 98, and Windows Me operating systems, and have access to the memory of the kernel and all running processes, as well as raw access to the hardware. Microsoft Corporation, (NASDAQ: MSFT, HKSE: 4338) is a multinational computer technology corporation with global annual revenue of US$44. ... Memory (Random Access Memory) Look up computing in Wiktionary, the free dictionary. ... Windows XP loading drivers during a Safe Mode bootup A device driver, or a software driver is a specific type of computer software, typically developed to allow interaction with hardware devices. ... The Windows 3. ... Windows 95 is a consumer-oriented graphical user interface-based operating system. ... Windows 98 (codenamed Memphis) is a graphical operating system released on June 25, 1998 by Microsoft and the successor to Windows 95. ... Windows Millennium Edition, or Windows Me (IPA pronunciation: [miː], [ɛm iː]), is a hybrid 16-bit/32-bit graphical operating system released on September 14, 2000 by Microsoft. ... An operating system (OS) is a set of computer programs that manage the hardware and software resources of a computer. ...


Prior to the advent of Windows, DOS applications frequently communicated directly with various pieces of hardware, by responding to interrupts, reading and writing device memory etc. Each application expected to have exclusive and complete control over the hardware. Though Windows applications don't often communicate directly with hardware, it was the only way to write Windows drivers, and still is in the real and standard modes of Windows 3.x. Despite the fact that Windows switched from running in real mode to protected mode, direct hardware access and interrupt hooking could still be done because when Windows switched to running in protected mode it kept the single privilege level model used in real mode. This lasted all the way through Windows 9x. Windows/386 and onwards allowed multiple MS-DOS applications to execute simultaneously. This was done by executing each legacy application within its own virtual machine. To share arbitrary physical resources amongst these virtual machines, Microsoft introduced dynamically-loadable virtual device drivers. These drivers solved issues relating to conflicting usage of physical resources by intercepting calls to the hardware. Instead of a machine port representing an actual device, it would represent a "virtual" device, which could be managed by the operating system. Instructions on how to use the directory command. ... 1. ... Ports on the Apple iBook (Early 2003) In computer hardware, a port serves as an interface between the computer and other computers or devices in the form of an electrically wired outlet on a piece of equipment into which a plug or cable connects. ...


The name VxD comes from the fact that most of these virtual device drivers had filenames like "v(something)d.386" in Windows 3.x. Some examples are: vjoyd.386 (joystick), vmm.386 (memory manager). VxDs usually have the filename extension .386 under Windows 3.x and .vxd under Windows 95. VxDs written for Windows 3.x can be used under Windows 95 but not vice versa. A filename extension is a suffix to the name of a computer file applied to show its format. ...


VxDs are no longer supported by Windows NT. Device drivers for Windows 2000 and Windows XP use the Windows Driver Model (WDM). Windows Vista supports both WDM and the newer Windows Driver Foundation which includes Kernel-Mode Driver Framework (KMDF) and User-Mode Driver Framework (UMDF). KMDF is also available for download for Windows XP and Windows 2000, while UMDF is available for Windows XP. Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. ... Windows 2000 (also referred to as Win2K) is a preemptible, interruptible, graphical and business-oriented operating system that was designed to work with either uniprocessor or symmetric multi-processor 32-bit Intel x86 computers. ... Windows XP is a line of proprietary operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, notebook computers, and media centers. ... In computing, the Windows Driver Model (WDM) — also known (somewhat misleadingly) at one point as the Win32 Driver Model — is a framework for device drivers that was introduced with Windows 98 and Windows 2000 to replace VxD, which was used on older versions of Windows such as Windows 95 and... Windows Vista is a line of graphical operating systems used on personal computers, including home and business desktops, notebook computers, Tablet PCs, and media centers. ... Windows Driver Foundation (WDF) is a Microsoft development group which is building tools to aid in the creation of high-quality device drivers for Windows 2000, Windows XP, Windows Server 2003, Windows Vista, and later editions of Windows. ... The Kernel-Mode Driver Framework (KMDF) is a Microsoft-developed driver framework that was developed to make it easier for driver developers to create and maintain Kernel mode device drivers for Windows 2000[1] and later releases. ... The User-Mode Driver Framework is a device-driver development platform first introduced with Microsofts Windows Vista operating system, and is also available for Windows XP. It facilitates the creation of drivers for certain classes of devices, where the driver operates entirely in user-land. ...


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VxD - definition of VxD in Encyclopedia (405 words)
VxD's written for Windows 3.x can be used under Windows 95 but not vice versa.
VxDs, on the other hand, run at privilege level or "ring" 0, i.e.
VxD are no longer supported by current versions of Windows.
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