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+This document describes the specifications of the ``virtio'' family of
+devices. These devices are found in virtual environments, yet by
+design they look like physical devices to the guest
+within the virtual machine - and this
+document treats them as such. This similarity allows the guest to use standard
+drivers and discovery mechanisms.
+
+The purpose of virtio and this specification is that virtual
+environments and guests should have a straightforward, efficient,
+standard and extensible mechanism for virtual devices, rather
+than boutique per-environment or per-OS mechanisms.