V

viewport:A rectangle in device space that is used to specify a transformation between page and device space. The viewport extents are always measured in pixels for a video display or dots for printers.

viewport extent:The width or height of the viewport.

viewport origin:The corner of the viewport from which the extents are measured. (The viewport-origin coordinates are specified with respect to the device-space origin.)

virtual-key code:A device-independent value that identifies the purpose of a keystroke as interpreted by the Windows keyboard device driver.

visible spectrum:Those wavelengths of light that can be observed by the human eye.

volume:A storage medium, such as a disk or tape, that is formatted to contain files and directories. A volume is accessed through a disk drive. In a path, a volume is referenced by the letter of the disk drive which accesses the volume. For example, a fixed disk may be referred to as “C:”. A single volume may be divided into more than one logical volume, also called a partition. Each partition is referenced by a unique volume identifier.