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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.
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References in periodicals archive ?
In another new development called ``Telemedicine'', Pedagog has a three-phase development plan with the assembly to provide A & E junior doctors with a palm top PC, enabling them to access specialist advice and visual information as they deal with patients in trauma.
Psion, the palm top computer group, suffered a 25 per cent drop to 115p, its lowest level since September 1998, after it said it was ditching a key new smartphone and chopping 100 jobs from its workforce.
With the electronic market booming and an upsurge in the range of palm top organisers on offer, the Message-Cam is a unique creation which is bound to impress your techno chums.
Worldwide Computer Products News-4 October 2000-Vodafone introduces new palm top package (C)1995-2000 M2 COMMUNICATIONS LTD
TELECOMWORLDWIRE-4 October 2000-Vodafone introduces new palm top package (C)1994-2000 M2 COMMUNICATIONS LTD
Gannett will test a new product palm top computers for delivery drivers.
It has already adapted Oracle Lite to run on palm top computers using Microsoft's Windows CE operating system, as well as 3Com Corp's Palm Pilot.
He is barred from entering Portrack at any time and being anywhere in Stockton whilst in possession of drug paraphernalia including hypodermic syringes or needles, tin foil, cigarette lighters and "palm top" weighing scales.
'Busy executives who have a lot to remember will usually have developed a system such as a diary or a palm top which is how they cope.
It moves around the house by attaching itself to sockets on the walls, has four pincers which work in the same way as hands and is controlled from a palm top computer.