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A computer is a machine for manipulating data according to a list of instructions known as a program.

Computers are extremely versatile. In fact, they are universal information-processing machines. According to the Church–Turing thesis, a computer with a certain minimum threshold capability is in principle capable of performing the tasks of any other computer, from those of a personal digital assistant to a supercomputer, as long as time and memory capacity are not considerations. Therefore, the same computer designs may be adapted for tasks ranging from processing company payrolls to controlling unmanned spaceflights. Due to technological advancement, modern electronic computers are exponentially more capable than those of preceding generations (a phenomenon partially described by Moore's Law).

Computers take numerous physical forms. Early electronic computers were the size of a large room, and such enormous computing facilities still exist for specialized scientific computation — supercomputers — and for the transaction processing requirements of large companies, generally called mainframes. Smaller computers for individual use, called personal computers, and their portable equivalent, the laptop computer, are ubiquitous information-processing and communication tools and are perhaps what most non-experts think of as "a computer". However, the most common form of computer in use today is the embedded computer, small computers used to control another device. Embedded computers control machines from fighter aircraft to digital cameras.

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500 AberBid - Online auctions for high performance computer hardware upgrades, motherboards, motherboard kits, processors and memory.
Meta Description: [ Award winning iSCSI SAN, NAS & rackmount server source. Leader in storage server solutions, server motherboards, custom configured rackmount servers and computer systems, 100+ motherboards and Bare-Bones Motherboard Kits. ]

C/Net Clearance Center - Provides auctions for computer systems, hardware, and software.
Meta Description: [ Clearance Center at CNET offers hot discount computers, overstock electronics and like-new refurbished electronics ]

CompUSA Auctions - Auctions of refurbished, discontinued, and returned items, organized by category.
Meta Description: [ Computer auction featuring, cheap, refurbished Compaq, Hewlett Packard, HP, Sony, Toshiba computers, notebooks, desktops, PDA’s, digital cameras, monitors and printers. ]

Computer Care Auctions - Free computer and software auctions. Also has options for other categories.
Meta Description: [ FREE! Online auction service provided by www.shopcomputercare.com ]

Dell Computer Auction - Online auction house for Dell computers.
Meta Description: [ Dell Auction, Dell Computer Auctions, Refurbished Dell Computers, Notebooks, Laptops, Desktops, Workstations, Monitors, Used Computer Systems. ]

Earthweb Direct - Buy new or visit the online auction for computer related products.

500 FairAuction - Specializing in hardware and software. Includes list of services and contact information.

Morgan Auction - Online computer auction of surplus computer equipment.

The Auction Depot Computer Sales - Offers limited computer auction sales. New items are generally added daily.

500 U-1.ca - Canadian site which has online auctions, classifieds, and free ads.
Meta Description: [ Ezead Canada Auctions and Ezead Canada Auction and Canada Classifieds - Canada Online Auctions and Classified sites, Canadian Online auction classifieds and free classifieds site an easy way to buy sell for online auctions, classifieds, and free ads ]

WholesaleAuction.com - Dealer only auction site for computer related merchandise.
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