H

Half duplex
a communications channel over which data transmissions can travel in both directions, but not at the same time.

Hardware
equipment in a computer system, such as the processor and external (peripheral) items such as a keyboard, display screen, and printer.

Help desk
a centralized and sometimes automated system for assisting an end user.

Help screen
on-screen assistance in completing specific software tasks.

Hierarchical structure
a database structure with one path from the highest level to a segment at the lowest level (one-to-many relationship).

High-level language
programming language that is easier for programmer to use rather than easier for computer to use; considered third-generation programming languages (3GL).

Holographic storage
storage technology using optical layers rather than a single-surface image.

Home page
initial or introductory page for a particular type of World Wide Web information, with options that are linked to further information on the chosen topic.

Host
a computer with two-way access to other computers in a network.

Human resources information system
an organization's employee information, including personal data and job records.

Human Resource Management (HRM)
management of the people as a valuable resource.

Hypertext Markup Language (HTML)
coding method used to provide links from one location to another on the World Wide Web.

Hypertext Transfer Protocol (HTTP)
protocol used for transferring from one location to another while using the World Wide Web.