A.k.a virtual drive or a RAM drive, is a file that represents as a physical disk drive to a guest operating system. The file maybe configured on the host and also on a remote file system. 

A virtual fax, also called as an "Internet fax", is a fax sent and received online, without the use of an actual fax machine. It uses IP networks to transport faxes instead of PSTN as its means of transporting a fax document.

The part of the Windows 95 and later operating system that handles long file names, which otherwise could not be handled by the original file allocation table file allocation table (FAT) programming. 

A software appliance that controls communication between virtual machines (VMs) in a virtual environment. A virtual firewall inspects packets and uses security policy rules to block unapproved communication between VMs.  

A disk image file format for storing the complete contents of a hard drive. The disk image, sometimes called a virtual machine, replicates an existing hard drive and includes all data and structural elements. 

Virtual hosting is a method for hosting multiple domain names (with separate handling of each name) on a single server (or pool of servers). This allows one server to share its resources, such as memory and processor cycles, without requiring all services provided to use the same host name. The term virtual hosting is usually used in reference to web servers but the principles carry over to other internet services.

The Virtual Instrument file format is used by National Instruments' LabVIEW development software. LABView lets you develop applications for automating and controlling processes in manufacturing and other environments. 

A local area network with a definition that maps workstations on some other basis than geographic location. The virtual LAN controller can change or add workstations and manage loadbalancing and bandwidth allocation easily.

A computing environment that emulates a physical computing environment. The virtualization layer manages the requests for CPU, memory, hard disk, network and other hardware resources, translatesthem to the underlying physical hardware.

The arrangement of resources (processors, memory, disks, network adapters and the user interface) assigned to a virtual machine. Configuration refers to both the specific elements included and the way those elements are set up.

A host program that allows a single computer to support multiple, identical execution environments. All the users see their systems as self-contained computers isolated from other users, even though every user is served by the same machine.

An operating system from the Digital Equipment Corporation (DEC) that runs in its older mid-range computers. 

A program that allows a computer to connect to a network. It can also be used to connect all the computers on a local area network (LAN) to a larger network such as the Internet or a collection of LANs.

A type of remote-control software that makes it possible to control another computer over a network connection. Keystrokes and mouse clicks are transmitted from one computer to another. 

A technology that facilitates the control of remotely located computer(s) or server(s) over the Internet. Data can be stored/retrieved, software can be run and peripherals can be operated through a Web browser as if the distant hardware were onsite.

A virtual office provides communication and address services that allow users to reduce traditional office costs while maintaining business professionalism.