H

hardware profiles

Settings that can be added to a computer to control the devices that are enabled when the computer is started. The default profile provides for all devices to be enabled when the computer is started. You can copy the default profile and then create a new hardware profile that disables some of the devices in the computer as needed.

Help and Support

Special tools built into Windows XP that assist the administrator and the user in ongoing management and maintenance of the computer and the Windows XP operating system. You can access these tools by pressing F1 while on the Windows XP desktop.

host

A computer that is on a TCP/IP network.

host ID

The unique IP address for a computer or other host within an IP subnet.

hostname

A hierarchical computer name that can be used within a network or between networks. The hostname must be unique within its own hierarchy.

Hosts file

A static file that is sometimes used for hostname resolution instead of or as a backup for DNS.

hot site

An extremely expensive and rarely used type of alternate site that provides a fully functional and fully tested computer and network environment to be used in case of a disaster.

hot spare

A device such as a hard drive or network interface card that is already in place and powered up; ready to be used in the event that the primary device fails.

hub

A device that works at Layer 1 of the OSI model and connects devices to each other without any intelligence or filtering.

Hypertext Transfer Protocol (HTTP)

An Application layer protocol in the TCP/IP protocol suite that is used to browse the World Wide Web.

Hypertext Transfer Protocol Secure (HTTPS)

An Application layer protocol in the TCP/IP protocol suite that is used to provide secure access to web pages on the Internet using Secure Sockets Layer.