~H~
hot key2 ~ Hz
A/B Switch box ~ America On-line AMI BIOS ~ Arithmetic Operation ARP ~ AVI Backbone ~ Bit Image Bit Map ~ Boot Disk Boot Drive ~ Bytes Per Inch C++ ~ Carrier Frequency carrier system ~ certification CGI ~ Chooser extension cipher ~ Clipper Chip clock ~ color color bits ~ communications satellite communications server ~ computer security CON ~ copy copy program ~ cycle time daemon ~ defragmentation demand paging ~ digitize DikuMUD ~ disk disk buffer ~ Document Style Semantics and Specification Language document window ~ dynamic Web page Easter egg ~ erase erase head ~ ezine F2F ~ finger2 firewall ~ font suitcase footer ~ FYI Game Control Adapter ~ GUI HAL ~ hot key1 hot key2 ~ Hz i486DX ~ internal modem internet ~ ISO 9660 ISO/OSI model ~ just-in-time K1 ~ knowledge base L1 cache ~ LU luggable computer ~ LZW compression MAC ~ MILNET mime ~ msec MTBF ~ MYOB named anchor ~ network drive Network File System ~ number crunching object ~ overwrite mode P5 ~ PC/XT keyboard PDA ~ pipeline processing piracy ~ preventive maintenance preview ~ pwd quasi-language ~ QWERTY keyboard R&D ~ registration marks Registry ~ RFI RF shielding ~ run-time library SAA ~ server error server push-pull ~ soft return software ~ style sheet stylus ~ System T1 ~ ToggleKeys token ~ typography UART ~ uupc V.120 ~ view2 viewer ~ VxD w3 ~ WinG WINS ~ WWW X.25 ~ X Windows Yahoo! ~ yotta- Z39.50 standard ~ Zulu time
hot key2
vb. To transfer to a different program by pressing a hot key.
hot link
n. A connection between two programs that instructs the second program to make changes to data when changes occur in the first program. For example, a word processor or desktop publishing program could update a document based on information obtained from a database through a hot link. See hyperlink.
hotlist
n. A list of frequently accessed items, such as Web pages in a Web browser, from which the user can select one. The hotlist of Web pages is called the bookmark list in Netscape Navigator and Lynx and is called the Favorites folder in Microsoft Internet Explorer.
hot spot
n. The position in a mouse pointer, such as the position at the tip of an arrow or the intersection of the lines in a cross, that marks the exact location that will be affected by a mouse action, such as a button press.
HotWired
n. A Web site affiliated with Wired magazine that contains news, gossip, and other information about the culture of the Internet: Hotwired.
HPFS
n. Acronym for High Performance File System. A file system available with OS/2 versions 1.2 and later. See also FAT file system, NTFS.
HPGL
n. Acronym for Hewlett-Packard Graphics Language. A language originally developed for images destined for plotters. An HPGL file consists of instructions that a program can use to reconstruct a graphical image.
HP/UX
n. Acronym for Hewlett-Packard UNIX. A version of UNIX developed by Hewlett-Packard for use on their workstations.
HREF
Short for hypertext reference. An attribute in an HTML document that defines a link to another document on the Web. See also HTML.
HTML+
n. An unofficial specification for enhancements to the original HTML, such as forms and tables. HTML+ was not adopted as a standard but influenced the HTML 2.0 and HTML 3.2 standards. See also HTML.
HTML
n. Acronym for Hypertext Markup Language. The markup language used for documents on the World Wide Web. HTML is an application of SGML that uses tags to mark elements, such as text and graphics, in a document to indicate how Web browsers should display these elements to the user and should respond to user actions such as activation of a link by means of a key press or mouse click. HTML 2.0, defined by the Internet Engineering Task Force (IETF), includes features of HTML common to all Web browsers as of 1995 and was the first version of HTML widely used on the World Wide Web. Future HTML development will be carried out by the World Wide Web Consortium (W3C). HTML 3.2, the latest proposed standard, incorporates features widely implemented as of early 1996. Most Web browsers, notably Netscape Navigator and Internet Explorer, recognize HTML tags beyond those included in the present standard. See also .htm, .html, SGML, tag (definition 3), Web browser.
HTML 2.0
n. A revised version of the HTML specification that added the capability for forms and eliminated certain little-used tags. Produced as an Internet Draft in mid-1994, HTML 2.0 represented common practice among browser developers at the time. It was standardized as an RFC in November 1995. See also HTML+, HTML, HTML 3.0, HTML 3.2, RFC.
HTML 3.0
n. A revised version of the HTML specification. Its primary enhancement to HTML 2.0 is the support of tables. HTML 3.0 was never standardized or fully implemented by a major browser developer. See also HTML+, HTML, HTML 2.0, HTML 3.2.
HTML 3.2
n. A World Wide Web Consortium (W3C) recommendation for an HTML standard that supersedes the proposed HTML 3.0 standard and adds features to HTML 2.0 such as applets, sub- and superscripts, tables, and text flow around images. See also HTML, HTML 2.0, HTML 3.0.
HTML document
n. A hypertext document that has been coded with HTML. See Web page.
HTML editor
n. A software program used to create and modify HTML documents (Web pages). Most HTML editors include a method for inserting HTML tags without actually having to type out each tag. A number of HTML editors will also automatically reformat a document with HTML tags, based on formatting codes used by the word processing program in which the document was created. See also tag (definition 3), Web page.
HTML validation service
n. A service used to confirm that a Web page uses valid HTML according to the latest standard and/or that its hyperlinks are valid. An HTML validation service can catch small syntactical errors in HTML coding as well as deviations from the HTML standards. See also HTML.
HTTP
n. Acronym for Hypertext Transfer Protocol. The client/server protocol used to access information on the World Wide Web. See also URL.
HTTPd
n. A small, fast HTTP server available free from NCSA. See also HTTP server, NCSA (definition 1).
HTTP-NG
n. Acronym for Hypertext Transfer Protocol Next Generation. A standard under development by the World Wide Web Consortium (W3C) for improving performance and enabling the addition of features such as security. Whereas the current version of HTTP establishes a connection each time a request is made, HTTP-NG will set up one connection (which consists of separate channels for control information and data) for an entire session between a particular client and a particular server.
HTTPS
n. Web server software for Windows NT. Developed by the European Microsoft Windows NT Academic Centre (EMWAC) at the University of Edinburgh, Scotland, it is available for download and offers such features as WAIS search capability. See also HTTP server, WAIS.
HTTP server
n. 1. Server software that uses HTTP to serve up HTML documents and any associated files and scripts when requested by a client, such as a Web browser. The connection between client and server is usually broken after the requested document or file has been served. HTTP servers are used on Web and Intranet sites. Also called Web server. See also HTML, HTTP, server (definition 2). 2. Any machine on which an HTTP server program is running.
HTTP status codes
n. Three-digit codes sent by an HTTP server that indicate the results of a request for data. Codes beginning with 1 respond to requests that the client may not have finished sending; with 2, successful requests; with 3, further action that the client must take; with 4, requests that failed because of client error; and with 5, requests that failed because of server error. See also 400, 401, 402, 403, 404, HTTP.
hub
n. In a network, a device joining communication lines at a central location, providing a common connection to all devices on the network. The term is an analogy to the hub of a wheel. See also active hub, switching hub.
hue
n. In the HSB color model, one of the three characteristics used to describe a color. Hue is the attribute that most readily distinguishes one color from other colors. It depends on the frequency of a light wave in the visible spectrum. See also color model, HSB. Compare brightness, saturation (definition 2).
hybrid circuit
n. A circuit in which fundamentally different types of components are used to perform similar functions, such as a stereo amplifier that uses both tubes and transistors.
hybrid computer
n. A computer that contains both digital and analog circuits.
HyperCard
n. An information-management software tool, designed for the Apple Macintosh, that implements many hypertext concepts. A HyperCard document consists of a series of cards, collected into a stack. Each card can contain text, graphical images, sound, buttons that enable travel from card to card, and other controls. Programs and routines can be coded as scripts in an object-oriented language called HyperTalk or developed as external code resources (XCMDs and XFCNs). See also hypertext, object-oriented programming, XCMD, XFCN.
hyperlink
n. A connection between an element in a hypertext document, such as a word, phrase, symbol, or image, and a different element in the document, another hypertext document, a file, or a script. The user activates the link by clicking on the linked element, which is usually underlined or in a color different from the rest of the document to indicate that the element is linked. Hyperlinks are indicated in a hypertext document through tags in markup languages such as SGML and HTML. These tags are generally not visible to the user. Also called hot link, hypertext link. See also anchor (definition 2), HTML, hypermedia, hypertext, URL.
hyperspace
n. The set of all documents that can be accessed by following hyperlinks in the World Wide Web. Compare cyberspace (definition 2), Gopherspace.
HyperTalk
n. The programming language used to manipulate HyperCard stacks. See also HyperCard.
hypertext
n. Text linked together in a complex, nonsequential web of associations in which the user can browse through related topics. For example, in an article with the word iron, traveling among the links to iron might lead the user to the periodic table of the elements or a map of the migration of metallurgy in Iron Age Europe. The term hypertext was coined in 1965 to describe documents presented by a computer that express the nonlinear structure of ideas as opposed to the linear format of books, film, and speech. The term hypermedia, more recently introduced, is nearly synonymous but emphasizes the nontextual element, such as animation, recorded sound, and video. See also HyperCard, hypermedia.
HyperWave
n. A World Wide Web server that specializes in database manipulation and multimedia.
hyphen
n. A punctuation mark (-) used to break a word between syllables at the end of a line or to separate the parts of a compound word. Word processing programs with sophisticated hyphenation capabilities recognize three types of hyphens: normal, optional, and nonbreaking. Normal hyphens, also called required or hard hyphens, are part of a word's spelling and are always visible, as in long-term. Optional hyphens, also called discretionary or soft hyphens, appear only when a word is broken between syllables at the end of a line; they are usually supplied by the word processing program itself. Nonbreaking hyphens are always visible, like normal hyphens, but they do not allow a line break. See also hyphenation program.
HYTELNET
n. A menu-driven index of Internet resources that are accessible via telnet, including library catalogs, databases and bibliographies, bulletin boards, and network information services. HYTELNET can operate through a client program on a computer connected to the Internet, or through the World Wide Web.
Hz
n. Abbreviation for hertz.
A/B Switch box ~ America On-line AMI BIOS ~ Arithmetic Operation ARP ~ AVI Backbone ~ Bit Image Bit Map ~ Boot Disk Boot Drive ~ Bytes Per Inch C++ ~ Carrier Frequency carrier system ~ certification CGI ~ Chooser extension cipher ~ Clipper Chip clock ~ color color bits ~ communications satellite communications server ~ computer security CON ~ copy copy program ~ cycle time daemon ~ defragmentation demand paging ~ digitize DikuMUD ~ disk disk buffer ~ Document Style Semantics and Specification Language document window ~ dynamic Web page Easter egg ~ erase erase head ~ ezine F2F ~ finger2 firewall ~ font suitcase footer ~ FYI Game Control Adapter ~ GUI HAL ~ hot key1 hot key2 ~ Hz i486DX ~ internal modem internet ~ ISO 9660 ISO/OSI model ~ just-in-time K1 ~ knowledge base L1 cache ~ LU luggable computer ~ LZW compression MAC ~ MILNET mime ~ msec MTBF ~ MYOB named anchor ~ network drive Network File System ~ number crunching object ~ overwrite mode P5 ~ PC/XT keyboard PDA ~ pipeline processing piracy ~ preventive maintenance preview ~ pwd quasi-language ~ QWERTY keyboard R&D ~ registration marks Registry ~ RFI RF shielding ~ run-time library SAA ~ server error server push-pull ~ soft return software ~ style sheet stylus ~ System T1 ~ ToggleKeys token ~ typography UART ~ uupc V.120 ~ view2 viewer ~ VxD w3 ~ WinG WINS ~ WWW X.25 ~ X Windows Yahoo! ~ yotta- Z39.50 standard ~ Zulu time