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Device driver in computing is a computer program that operates or
controls a particular type of device that is attached to a computer. A
driver typically communicates with the device through the computer bus
or communications subsystem to which the hardware connects. When a
calling program invokes a routine in the driver, the driver issues
commands to the device. Once the device sends data back to the driver,
the driver may invoke routines in the original calling program. Drivers
are hardware-dependent and operating-system-specific. They usually
provide the interrupt handling required for any necessary asynchronous
time-dependent hardware interface.
Virtual device drivers represent a particular variant of device drivers.
They are used to emulate a hardware device, particularly in
virtualization environments, for example when a DOS program is run on a
Microsoft Windows computer or when a guest operating system is run on,
for example, a Xen host. Instead of enabling the guest operating system
to dialog with hardware, virtual device drivers take the opposite role
and emulate a piece of hardware, so that the guest operating system and
its drivers running inside a virtual machine can have the illusion of
accessing real hardware. Attempts by the guest operating system to
access the hardware are routed to the virtual device driver in the host
operating system as e.g., function calls. The virtual device driver can
also send simulated processor-level events like interrupts into the
virtual machine.
Virtual devices may also operate in a non-virtualized environment. For
example a virtual network adapter is used with a virtual private
network, while a virtual disk device is used with iSCSI. A good example
for virtual device drivers can be "Daemon Tools".
There are several variants of virtual device drivers. Download Laptop Drivers for Windows XP 7 8 Vista.
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