The Global Address List (GAL) A directory service within the Exchange email system. The GAL contains information for all email users and distribution groups. The GAL is the default address book.

Gigabyte (GB)

Gigabyte = 1,024 megabytes = 1,073,741,824 (2 to the 30th power) bytes, or characters of information.

Graphics Interchange Format (GIF) (.gif)

A bit-mapped file format that is a standard for displaying images on the Web, it allows upto 256 specific colours to be referenced in an image. It is also possible to create GIF animations. The file extension is .gif



The physical components of a computer system.

HE or Hosted Exchange

Hosted Exchange - A hosted version of Microsoft's Exchange platform.


Hits are a record of how many items are retrieved from a web server. For example, a visit to a web page with two graphics would record 3 hits-1 hit for the page, and 2 hits for the graphics. Hits are frequently mistaken for the number of visits to a given site, but as one visit is likely to generate a number of hits page views are a more accurate measure of traffic.


The introductory page for a website.

HyperText Markup Language (HTML)

Code used to describe the layout of a page for use on the World Wide Web. Common extensions are .htm or .html

HyperText Transport Protocol HTTP

The transmission standard used to send HTML documents across the Web.


A hyperlink is a graphic or a piece of text in an Internet document that can connect readers to another website, another page within the same website, or allows you to download a file. Also known as a 'link.'



Internet Protocol (IP) is the method or protocol by which data is sent from one computer to another on the Internet or on the same private network.

IP Address

An identifier for a computer or device on a TCP/IP network. Networks using the TCP/IP protocol route messages based on the IP address of the destination. The format of an IP address is a 32-bit numeric address written as four numbers separated by periods. Each number can be zero to 255. For example, could be an IP address.


Information Security Management System


International Standards Organization - is the International Standards Organizations. They do not create standards but (as with ANSI) provide a means of verifying that a proposed standard has met certain requirements for due process, consensus, and other criteria by those developing the standard.

Internet Service Provider (ISP)

A company that provides access to the Internet.



An object-oriented programming language developed by Sun Microsystems.


A scripting language developed by Netscape to allow designers to add interactivity to their websites. JavaScript can interact with HTML code to enable dynamic content.

JPEG (.jpg)

An acronym for Joint Photographic Experts Group, a JPEG is the most commonly used type of digital image format. By eliminating very subtle colour distinctions that the human eye usually cannot detect, JPEG images are compressed so that they can save faster and use less space. JPEG format actually alters an image, meaning that a certain amount of data is lost every time a JPEG is edited, saved, and compressed again.



Local Area Network. A group of connected computers usually located in close proximity (such as the same building or floor of the building) so that data can be passed among them.


A pointer in an HTML document that leads to another World Wide website, or to another place within the same site; also called a hyperlink. A link is activated by clicking on it.