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In the November issue of Computer

e-Science technology seeks to provide a network-centric infrastructure that gives researchers easy access to grid tools, resources, and archives. This special issue includes five contributions that address some of the challenges and give an overview of the latest research results in this area.


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computer Last modified: Monday, June 25, 2007





Best Practices for Microsoft Exchange 2007 with HP Servers and Storage in Mid-Range Environments
This paper provides configuration and performance data, best practices, and recommendations to help system administrators deploy Microsoft Exchange Server 2007 on several of the HP Modular Smart Array family of products. »
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Deploying SharePoint Server 2007 with Hyper-V on HP ProLiant Servers
This white paper outlines a list of Hyper-V "best practices" with Office SharePoint Server 2007, along with considerations for deploying Office SharePoint Server 2007 with Hyper-V on HP ProLiant servers and HP BladeSystem servers. »
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Performance and Scalability of MSFT Exchange Server 2007 on HP ProLiant Multi-Processor Server Blades
This performance brief summarizes scalability testing of Microsoft Exchange Server 2007 on HP ProLiant blade servers. The test scenario was a proof-of-concept for a customer deployment of Microsoft Exchange Server 2007 Service Pack 1 in an ISP environment, using Internet protocols for client access. »


A programmable machine. The two principal characteristics of a computer are:
It responds to a specific set of instructions in a well-defined manner.
It can execute a prerecorded list of instructions (a program).
Modern computers are electronic and digital. The actual machinery -- wires, transistors, and circuits -- is called hardware; the instructions and data are called software.

All general-purpose computers require the following hardware components:

memory : Enables a computer to store, at least temporarily, data and programs.
mass storage device : Allows a computer to permanently retain large amounts of data. Common mass storage devices include disk drives and tape drives.
input device : Usually a keyboard and mouse, the input device is the conduit through which data and instructions enter a computer.
output device : A display screen, printer, or other device that lets you see what the computer has accomplished.
central processing unit (CPU): The heart of the computer, this is the component that actually executes instructions.
In addition to these components, many others make it possible for the basic components to work together efficiently. For example, every computer requires a bus that transmits data from one part of the computer to another.

Computers can be generally classified by size and power as follows, though there is considerable overlap:

personal computer : A small, single-user computer based on a microprocessor. In addition to the microprocessor, a personal computer has a keyboard for entering data, a monitor for displaying information, and a storage device for saving data.
workstation : A powerful, single-user computer. A workstation is like a personal computer, but it has a more powerful microprocessor and a higher-quality monitor.
minicomputer : A multi-user computer capable of supporting from 10 to hundreds of users simultaneously.
mainframe : A powerful multi-user computer capable of supporting many hundreds or thousands of users simultaneously.
supercomputer : An extremely fast computer that can perform hundreds of millions of instructions per second.






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