VCACHE
A 32-bit, protected-mode cache driver, which replaces the 16-bit, real-mode SMARTDrive disk cache software.

VCOMM
In Windows, a 32-bit protected-mode communications driver.

Vector fonts
Fonts rendered from a mathematical model, in which each character is defined as a set of lines drawn between points. Vector fonts can be scaled to any size or aspect ratio.

Version table
A file that contains a list of executable files, followed by the version number of MS-DOS with which the applications were designed to run.

Vertical Blanking Interval (VBI)
The time period in which a television signal is not visible on the screen because of the vertical retrace (the repositioning to top of screen to start a new scan). Data services can be transmitted using a portion of this signal.

VFAT
32-Bit File Access using protected-mode code to write to the disk. In Windows 98 the 32-bit virtual File Allocation Table (VFAT) file system is the primary file system.

Video Electronic Standards Association (VESA)
An industry standards organization focusing on IBM-compatible personal computers.

Video Graphics Array (VGA)
A display standard for personal computers.

Virtual memory
Memory that appears to an application to be larger and more uniform than it is.

Virtual private networking (VPN)
A technology by which one can securely connect to a remote server by tunneling through an intermediary network.

Virtualisation
The act of managing a system resource so that more than one application can use it at the same time.

VRML
Virtual Reality Modeling Language. A language for coding three-dimensional HTML applications.

VxD
Virtual device driver. The x represents the type of device—for example, a virtual device driver for a display is a VDD and a virtual device driver for a printer is a VPD.