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Glossary A - D
Glossary E - I
Glossary J - P
Glossary Q - S
Glossary T - Z


  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  


T-1 A digital leased-line connection capable of carrying data at 1,544,000 bits-per-second. The T-1 line carries 24 pulse code modulation (PCM) signals using time-division multiplexing (TDM) at an overall rate of 1.544 Mbps. T-1 lines use copper wire and span distances within and between major metropolitan areas. T-3 (44.736 Mbps) is a higher speed digital line using the same technology. (See also DSx.)
TCP/IP (Transmission Control Protocol/Internet Protocol) - This is the suite of protocols that defines Internet communications. TCP/IP is a two-layer program. The higher layer, Transmission Control Protocol, manages the assembling of a message or file into smaller packets that are transmitted over the Internet and received by a TCP layer that reassembles the packets into the original message. The lower layer, Internet Protocol, handles the address part of each packet so that it gets to the right destination. Each gateway computer or router on the network checks this address to see where to forward the message. Even though some packets from the same message are routed differently than others, they are reassembled at the destination. TCP/IP uses the client/server model of communication in which a computer user (a client) requests and is provided a service (such as sending a web page) by another computer (a server) on the network. TCP/IP communication is primarily point-to-point, meaning each communication is from one point (or host computer) in the network to another point or host computer.
Telnet Telnet is the way to access another computer, assuming you have permission. (Such a computer is frequently called a host computer.) More technically, Telnet is a user command and an underlying TCP/IP protocol for accessing remote computers. On the web, HTTP and FTP protocols allow you to request specific files from remote computers, but not to actually be logged on as a user of that computer. With Telnet, you log on as a regular user with whatever privileges you may have been granted to the specific application and data on that computer. Telnet is most likely to be used by program developers and anyone who has a need to use specific applications or data located at a particular host computer.
Terabyte (TB) - 1024 gigabytes, 240 bytes.
Top Level Domain Name

(TLD) - The part of a domain name that identifies it generically as a domain class such as .com (commercial), .net (network), .org (for nonprofit organizations, industry groups, and others), .gov (government), .mil (for the military), and .edu (for educational institutions). For example, in the domain name,

the Net is the top level domain name.


(Uniform Resource Locator) - The standard way to give the address of any resource on the Internet that is part of the World Wide Web. The type of resource depends on the Internet application protocol. Using the web's HTTP protocol, the resource can be an HTML page, an image file, a program such as a CGI or Perl script, or any other file supported by HTTP. The URL contains the name of the protocol required to access the resource, a domain name that identifies a specific computer on the Internet, and a hierarchical description of a file location on the computer. On the web (which uses HTTP), an example of a URL is:


This URL describes a web page to be accessed with an HTTP (web browser) application that is located in a domain named The specific file is named 'glossary5.html' and is in the directory named 'glossary'.

Usenet A collection of user-submitted messages on various subjects (discussion groups) that are posted to servers on the World Wide Web. Each subject collection of posted messages is known as a newsgroup. There are thousands of newsgroups and it is possible for you to form new ones. Usenet's original protocol was UUCP (UNIX-to-UNIX Copy), but today NNTP is used.
UNIX (also spelled 'Unix') - An operating system that originated at Bell Labs in 1969. UNIX is a popular operating system for web servers because it is more reliable than Windows NT. Because it was not a proprietary operating system owned by one of the leading computer companies and because it is written in a standard language ("C") and embraced many popular ideas, UNIX became the first open or standard operating system that could be improved or enhanced by anyone. Many of the major computer companies have created their own versions of UNIX (such as AIX by IBM, HP-UX by HP, and Solaris by Sun Microsystems).
VB Script The Microsoft® Visual Basic® programming language is a fast, portable, lightweight interpreter for use in web browsers and other application objects such as ActiveX® Controls.
Virtual Hosting The provision of web hosting services by a service provider so that a company doesn't have to purchase and maintain its own web servers and connections to the Internet. Some companies providing this service simply call it "hosting." Typically, virtual hosting provides a customer who wants a web site with file storage and directory setup for the web site files (HTML and graphic image files), e-mail addresses, provisions for the execution of scripts, and more. The user (the web site owner) needs only to have an FTP program for exchanging files with the host. Usually, the server is shared by multiple Web site owners (shared hosting) so that each owner can use and administer it as though they had complete control of the server. Users of a virtual server do not have to manage the hardware and software aspects of maintaining a server and effectively share the cost of expensive network connections to the Internet.
Virus A program, usually hidden or disguised as something else that causes some unexpected and usually undesirable event. A computer virus is often designed so that it is automatically spread to other computer users. Viruses can be transmitted as attachments to e-mail messages, within downloaded files, or on a floppy disk or CD. The source of the e-mail message, downloaded file, or disk is often unaware of the virus. Some viruses wreak their havoc as soon as their code is executed; other viruses lie dormant until predefined circumstances (such as a date) cause their code to be executed by the computer. Some viruses are playful in intent and effect and some can be quite harmful, erasing data or causing your hard disk to require reformatting. The best protection against computer viruses is a good antivirus program such as Norton Antivirus.
WAN (Wide Area Network) - Any internet or network that covers an area larger than a LAN.

(Pronounced as though spelled "wares" or by some pronounced like the city of "Juarez") - A term used by software "pirates" to describe software that has been stripped of its copy-protection and made available on the Internet for downloading.

Web Refers to the World Wide Web. The usage of 'web' was a reference to the multiple interconnections of the packet switching network that forms the Internet.
Web Browser Client software that is used to look at a number of different kinds of Internet resources. Examples include Microsoft® Internet Explorer, Netscape, and Opera.
Web Host (1) A web server computer that stores and serves the HTML pages, images, files, etc. for one or more web sites. (2) The company that provides that service, which is known as hosting.
Web Page An HTML document with its own web address (URL). The first page usually requested from a web site is called the 'home page'. With frames, multiple pages (HTML files) can be downloaded to a browser and arranged on designated sections of the display screen at the same time - these are also collectively termed a 'web page'.
Web server A computer that stores all of the HTML pages, graphic images, scripts, etc. that make up a web site and respond to clients with the requested data.
Web Site A collection of interlinked web pages, usually under a single domain name, which includes an intended beginning file called a 'home page.' From the home page, the user can get to the other pages on the web site.
Whois A program or script used to query databases of domain names, IP addresses, and their associated contact information that are maintained by the domain name registrars.
Windows® NT Microsoft's original 32-bit operating system. Some web hosting companies use Windows NT (or it's successor Windows 2000) in their servers to offer support for Microsoft base products such as MS Access, MS SQL, and FrontPage. FrontPage extensions are also available on many UNIX and Linux-based servers.
World Wide Web (WW W) - All the resources and users on the Internet that use HTTP.
WYSIWYG (What You See Is What You Get) - A graphical editor or program that allows the user to create a web page, text file, or image so that he or she can see what the end result will look like while the document is being created. WYSIWYG web page editors such as Adobe PageMill, Macromedia Dreamweaver, and Microsoft FrontPage are used to create HTML pages but conceal the actual markup language (HTML) and allow the creator to think almost entirely in terms of how the page should appear.

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