| Terminology means Technical Definition, here are some terminologies used for computers, they are categorized alphabetically, either you scroll down the page until you reach the terminology you wants, or it would be easier to click the terminology you want from the list. I hope you like this page and make a good use of it, also there will be an updates in the future, you may visit it regularly. | |
|
|
| Letter V : | VBScript - Video Adapter - Virtual Community - Virtual Hosting - Virtual LAN - Virtual Machine - VRML |
| VBScript |
|
VBScript is
an interpreted script language from Microsoft that is a subset of its Visual Basic
programming language. VBScript can be compared to other script languages designed for the
Web, including:
In general, script languages are easier and faster to code in than the more structured, compiled languages such as C and C++ and are ideal for smaller programs of limited capability or that can reuse and tie together existing compiled programs. VBScript is Microsoft's answer to Netscape's popular JavaScript. Both are designed to work with an interpreter that comes with a Web browser - that is, at the user or client end of the Web client/server session. VBScript is designed for use with Microsoft's Internet Explorer browser together with other programming that can be run at the client, including ActiveX controls, automation servers, and Java applets. Although Microsoft does support Netscape's JavaScript (it converts it into its own JScript), Netscape does not support VBScript. For this reason, VBScript is best used for intranet Web sites that use the Internet Explorer browser only.
|
|
| Selected Links | |
| Microsoft provides a VBScript Overview in its Windows Script Technologies section.. | |
| VBScript -
A Comparison with JavaScript provides a detailed comparison.
|
|
| Video Adapter |  |
| A video
adapter (also called a display adapter or video board ) is an integrated
circuit card in a computer or, in some cases, a monitor that provides digital-to-analog
conversion, video memory, and a video controller so that data can be sent to and
constantly refreshed for a computer's display. Today, almost all displays and video
adapters adhere to a common denominator de facto standard, Video Graphics Array (VGA). VGA
describes how data - essentially red, green, blue data streams - is passed between the
computer and the display. It also describes the frame refresh rates in hertz. It also
specifies the number and width of horizontal lines, which essentially amounts to
specifying the resolution of the pixels that are created. VGA supports four different
resolution settings and two related image refresh rates. In addition to VGA, most displays today adhere to one or more standards set by the Video Electronics Standards Association (VESA). VESA defines how software can determine what capabilities a display has. It also identifies resolutions setting beyond those of VGA. These resolutions include 800 by 600, 1024 by 768, 1280 by 1024, and 1600 by 1200 pixels.
|
|
| Virtual Community | |
| A virtual
community is a community of people sharing common interests, ideas, and feelings over the
Internet or other collaborative networks. A possible inventor of this term and one of its
first proponents was Howard Rheingold, who created one of the first major Internet
communities, called "The Well." In his book, The Virtual Community,
Rheingold defines virtual communities as social aggregations that emerge from the Internet
when enough people carry on public discussions long enough and with sufficient human
feeling to form webs of personal relationships in cyberspace. Virtual communities might be thought of as subgroups within Marshall McLuhan's notion of cyberspace as a "global village." Before the Web, virtual communities existed on bulletin board services (BBSs) and many still do. Some virtual communities or facilitators of them use the metaphor of a coffee house or something similar to help users visualize the community. In general, there are two kinds of communication among virtual community members: message postings and real-time chat. Usenet newsgroups are an example of the former. Many Web sites, such as Geocities, foster subject information exchanges. For real-time chat, Internet Relay Chat (IRC) is a system used by many Web sites that foster virtual communities. Originally a bulletin board service, The Well now has a home on the Web. The Well charges $10 a month for membership and offers more than 260 subject areas (called "conferences") that range "from the technical and specific to the abstract and surreal." It has thousands of members.
|
|
| Selected Links | |
| Geocities has facilitiated virtual communities that it calls "neighborhoods." | |
| You can also read parts
of Howard Rheingold's
book on the Web.
|
|
| Virtual Hosting | |
| On the
Internet, virtual hosting is the provision of Web server and other services so that a
company or individual doesn't have to purchase and maintain their own Web server host with
a line to the Internet. A virtual hosting provider is sometimes called a Web or Internet
"space provider." Some companies providing this service simply call it
"hosting." Typically, virtual hosting provides a customer who wants a Web site
with: domain name registration assistance, multiple domain names that map to the
registered domain name, an allocation of file storage and directory setup for the Web site
files (HTML and graphic image files), e-mail addresses, and, optionally, Web site creation
services. The virtual hosting user (the Web site owner) needs only to have a File Transfer
Protocol (FTP) program for exchanging files with the virtual host. Some virtual hosting providers make it possible for customers to have more control of their Web site file system, e-mail names, passwords, and other resources and say that they are providing each customer a virtual server.
|
|
| Selected Links | |
| In Seattle, a company called Virtual Servers or "VServers" compares a virtual server to virtual hosting. | |
| Our own virtual hosting provider (we usually use the term "space provider" but agree that the service is more than just space) is Mediaflow in Broomfield, Colorado. | |
| Affinity Hosting is one of the thousands
of virtual hosting providers around the world.
|
|
| Virtual LAN | |
| A virtual
(or logical) LAN is a local area network with a definition that maps workstations on some
other basis than geographic location (for example, by department, type of user, or primary
application). The virtual LAN controller can change or add workstations and manage
loadbalancing and bandwidth allocation more easily than with a physical picture of the
LAN. Network management software keeps track of relating the virtual picture of the local
area network with the actual physical picture. VLANs are considered likely to be used with campus environment networks. Among companies likely to provide products with VLAN support are Cisco, Bay Networks, and 3Com. There is a proposed VLAN standard, IEEE 802.10.
|
|
| Virtual Machine | |
| 1) In
the most recent computer usage, virtual machine is a term used by Sun Microsystems,
developers of the Java programming language and runtime environment, to describe software
that acts as an interface between compiled Java binary code and the microprocessor (or
"hardware platform") that actually performs the program's instructions. Once a
Java virtual machine has been provided for a platform, any Java program (which, after
compilation, is called bytecode) can run on that platform. Java was designed to
allow application programs to be built that could be run on any platform without having to
be rewritten or recompiled by the programmer for each separate platform. Java's virtual
machine makes this possible. The Java virtual machine specification defines an abstract rather than a real "machine" (or processor) and specifies an instruction set, a set of registers, a stack, a "garbage-collected heap," and a method area. The real implementation of this abstract or logically defined processor can be in other code that is recognized by the real processor or be built into the microchip processor itself. The output of "compiling" a Java source program (a set of Java language statements) is called bytecode. A Java virtual machine can either interpret the bytecode one instruction at a time (mapping it to a real microprocessor instruction) or the bytecode can be compiled further for the real microprocessor using what is called a just-in-time (JIT) compiler. 2) In IBM, a virtual machine is any multi-user shared-resource operating system that gives each user the appearance of having sole control of all the resources of the system. 3) In IBM, a virtual machine is also used to mean an operating system that is in turn managed by an underlying control progam. Thus, IBM's VM/ESA can control multiple virtual machines on an IBM S/390 system. 4) Elsewhere, virtual machine has been used to mean either an operating system or any program that runs a computer. We quote:
|
|
| Selected Links | |
| You'll find an academic discussion of operating systems and virtual machines at CIS 307: Views, Components, and Architectures of Operating Systems. | |
| For an overview of the
Java virtual machine, see the initial pages of The Java
Virtual Machine Specification.
|
|
| VRML | |
| VRML
(Virtual Reality Modeling Language) is a language for describing three-dimensional (3-D)
image sequences and possible user interactions with them. Using VRML, you can build a
sequence of visual images into Web settings with which a user can interact by viewing,
moving, rotating, and otherwise interacting with an apparently 3-D scene. For example, you
can view a room and use controls to move the room as you would experience it if you were
walking through it in real space. To view a VRML file, you need a VRML viewer or browser, which can be a plug-in for a Web browser you already have. Among viewers you can download for the Windows platforms are blaxxun's CC Pro, Platinum's Cosmo Player, WebFX, WorldView, and Fountain. Whurlwind and Voyager are two viewers for the Mac.
|
|
| Selected Links | |
| The CC Pro viewer can be downloaded from blaxxun. | |
| For more information, visit the VRML Consortium and the VRML Repository. | |
| We recommend Netscape's A Beginner's Guide to VRML.
|
|
______________________________________________________________ |
|
| Designed
By Wessam Sherif, All Rights Reserved.
|
|