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A laptop computer that weighs less than four pounds. In order to reduce weight, subnotebooks, also called "Ultrabooks" or "ultralights," often eliminate built-in CD/DVD drives. However, if optical discs are required when traveling, an external drive in the travel bag generally adds more weight than a built-in drive.

The Mini Laptop/Netbook
In the 2007 time frame, subnotebooks called "mini laptops" and "netbooks" made their debut, the latter term coined by Intel for machines that use its Atom processor. Weighing up to three pounds, mini laptops/netbooks have screens from 8 to 10" (see netbook). For features of portable computers, see laptop. See ultrathin laptop, notebook and Ultrabook.

The Trend Setter
In 1998, Sony popularized the subnotebook class with its VAIO (pronounced "vy-o") 505G at three pounds and less than an inch thick. To reduce traveling weight, floppy and CD-ROM drives were external, and a docking station was included. (Image courtesy of Sony Corporation.)

Laptop and Netbook
The Acer netbook on the right sports an 8.9" screen compared to 15" on its big brother to the left. Netbooks sacrifice keyboard and screen size for portability.
References in periodicals archive ?
Finally, Hunkar will introduce a Machine Qualifier Kit, which includes Class-Meter module, sensors, software, and a palmtop computer that can communicate with the machine monitor via infrared without need for a network.
Psion has two new additions to its family of palmtop computers: the Series 3c palmtop computer and the Siena organizer.
With virtually no competition, Sparcom has developed peripherals and software that connect the HP 95LX palmtop computer to either a Mac or an IBM-compatible.
We see using a palmtop computer in class with a laptop and Minitab as a major breakthrough in teaching and learning.
The palmtop computer, second last year, didn't make the top 10:
Psion Computers, the retail arm of London, UK-based palmtop computer maker, Psion Plc, is losing market share in a sector that is generally perceived to be one of the most buoyant in the market.
The world's three top mobile phone producers have teamed up with palmtop computer maker Psion to push forward the frontiers of wireless computing.
A small, portable, high-fidelity display and spatially aware palmtop computer can act as a window onto the 3D-situated information space--providing a bridge between the computer-synthesized data and physical objects.
Psion Plc, the London-based palmtop computer maker and operating system developer, will give investors an anxious time over the next twelve months.
She identifies the owners of Club Veeda as Endigo Entertainment and tells Terry they are running a scam, copying the numbers from credit cards into a palmtop computer.