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The Greening of IT
294 How Companies Can Make a Difference for the Environment

GUI (Graphical User Interface)
A pictorial way of representing to a user the capabilities of a system and
the work being done on it.
host
In the TCP/IP sense, a computer that enables users to communicate with
other host computers on a network. Individual users communicate by
using application programs, such as electronic mail and FTP. Also, refers
to a large computer system, such as a mainframe.
HPC (High Performance Computing)
Uses supercomputers and computer clusters to solve advanced computa-
tion problems.
HTML (Hypertext Markup Language)
The language used to write World Wide Web documents, or pages. It is
a subset of ISO SGML.
HTTP (Hypertext Transfer Protocol)
The protocol used by the World Wide Web to transfer documents
between clients and servers. ptg

HVAC (Heating, Ventilating, and Air Conditioning)
The engineering discipline related to heating, ventilating, and cooling
buildings.
Hyper-V
A Microsoft Windows Server 2008 hypervisor-based server virtualization
technology. Allows separate virtual machines (VMs) running on a single
physical machine. Like other virtualization software (for example,
VMware), Hyper-V also can run multiple different operating systems—
Windows, Linux, and others-in parallel—on a single server.
IDC (International Data Corporation)
A market research and analysis firm specializing in information technol-
ogy, telecommunications, and consumer technology.
IEEE (Institute of Electical and Electronic Engineers)
An international non-profit, professional organization for the advance-
ment of technology related to electricity.
Insight Control
A tool from HP for measuring and managing energy use in servers and
other IT equipment. Insight Control allows management of HP
ProLiant and BladeSystem infrastructure systems. The management
includes power measurement and power capping.