Microsoft Windows Server 2003 Deployment Kit—Deploying Microsoft Internet Information Services (IIS) 6.0 [Electronic resources]

Microsoft Corporation

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H

hash

A fixed-size result that is obtained by applying a one-way mathematical function (sometimes called a hash algorithm) to an arbitrary amount of data. If there is a change in the input data, the hash changes. The hash can be used in many operations, including authentication and digital signing. Also called a message digest.

See also authentication.

See also hash algorithm.

hash algorithm

An algorithm that produces a hash value of some piece of data, such as a message or session key. With a good hash algorithm, changes in the input data can change every bit in the resulting hash value; for this reason, hashes are useful in detecting any modification in a data object, such as a message. Furthermore, a good hash algorithm makes it computationally infeasible to construct two independent inputs that have the same hash. Typical hash algorithms include MD2, MD4, MD5, and SHA-1. Also called a hash function.

See also MD5.

See also Secure Hash Algorithm (SHA-1).

headless server

See remotely administered server.

heaps

A portion of memory reserved for a program to use for the temporary storage of data structures whose existence or size cannot be determined until the program is running.

Help and Support Center

A unified place where a user can access all Help and Support content and services from both Microsoft and the OEM.

hexadecimal

A base-16 number system represented by the digits 0 through 9 and the uppercase or lowercase letters A (equivalent to decimal 10) through F (equivalent to decimal 15).

home directory

The root directory for a Web site, where the content files are stored. Also called a document root or Web root. In Internet Information Services (IIS), the home directory and all its subdirectories are available to users by default. Also, the root directory for an IIS service. Typically, the home directory for a site contains the home page.

See also home page.

home page

In the context of Internet Explorer, the home page is the first page users see when they start the browser. "Home page" is also a more general term for the main page of a Web site, which usually contains a main menu or table of contents with links to other pages within the site.

host

Any device on a TCP/IP network that has an Internet Protocol (IP) address. Examples of hosts include servers, workstations, network-interface print devices, and routers. Sometimes used to refer to a specific network computer that is running a service used by network or remote clients.

For Network Load Balancing, a cluster consists of multiple hosts connected over a local area network (LAN).

See also client.

See also cluster.

See also local area network (LAN).

See also Network Load Balancing.

See also server.

See also Transmission Control Protocol/Internet Protocol (TCP/IP).

host name

The DNS name of a device on a network. These names are used to locate computers on the network. To find another computer, its host name must either appear in the Hosts file or be known by a DNS server. For most Windows-based computers, the host name and the computer name are the same.

See also Domain Name System (DNS).

hotfix

An update to address an issue identified after a software product has been distributed. Hotfix distribution is limited by its licensing terms.

HTML

See Hypertext Markup Language (HTML).

HTTP

See Hypertext Transfer Protocol (HTTP).

HTTP header

An informational listing at the top of a Hypertext Transfer Protocol (HTTP) request or response.

HTTPS

See Secure Hypertext Transfer Protocol.

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 denote formatting and hypertext links.

See also American Standard Code for Information Interchange (ASCII).

Hypertext Transfer Protocol (HTTP)

The protocol used to transfer information on the World Wide Web. An HTTP address (one kind of Uniform Resource Locator (URL)) takes the following form: protocol.