Hardware tree
The hierarchical representation of all the buses and devices on a computer.

HDLC
High-level Data Link Control. A protocol for information transfer in which messages are transmitted in frames.

High Performance File System (HPFS)
An OS/2 file system that allows long file names.

HiPack
A file and folder compression format.

Home page
The central document of a Web site, usually designated as the default document. The starting point for a Web site or section of a Web site is often referred to as the home page.

Host ID
The portion of the IP address that identifies a particular computer within a particular network ID.

Host table
The HOSTS or LMHOST file that contains lists of known IP addresses mapped to host names or NetBIOS computer names. Windows 98 uses this for local name resolution if other methods are not available.

Hot docking
Insertion of a device in the system while the device is running at full power

HTML
See Hypertext Markup Language.

HTTP
See Hypertext Transfer Protocol.

Human Interface Device (HID) specification
The device class definition developed by the USB standards group for HIDs. Serves as the basis for the WDM input device support, and unifies input devices by providing flexible data reporting, typeless data, and arrayed and variable input and output.

Hyperlink
Also called simply a link. A way of jumping to another place on the Internet. Hyperlinks usually appear in a different format from regular text. You initiate the jump by clicking the link.

Hypertext
Documents with links to other documents. Click a link to display the other document. A hypertext document is a document structured in chunks of text and marked up, usually using HTML, which is connected by links.

Hypertext Transfer Protocol (HTTP)
The underlying protocol by which Web clients and servers communicate. HTTP is an application-level protocol for distributed, collaborative, hypermedia information systems. It is a generic, stateless, object-oriented protocol. A feature of HTTP is the typing and negotiation of data representation, allowing systems to be built independently of the data being transferred.

Hypertext Markup Language (HTML)
A simple markup language used to create hypertext documents that are portable from one platform to another. HTML files are simple ASCII text files with codes embedded (indicated by markup tags) to indicate formatting and hypertext links. The formatting language used for documents on the World Wide Web.