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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, an external USB optical disc can always be added.

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 used 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 both cases, a number of residents volunteered to collect the data, and they were provided a palmtop computer equipped with a global positioning system (GPS) module to supply position data.
Mainstays of the field, such as Legos, model-airplane servomotors, and the Massachusetts Institute of Technology (MIT) HANDY BOARD, are being augmented by new components, such as palmtop computers and the Carnegie Mellon University (CMU) CMUCAM, that provide considerably more sensing and computation than were previously available.
Hewlett-Packard introduces a so-called palmtop computer with an infrared link for transferring data.
These parameters can be measured with use of a portable spirometer interfaced with a palmtop computer. The data is transferred via a Web-based system to a central computer for storage and analysis, followed by immediate feedback in the form of treatment instructions.
Kauppalehti Online, the online service of Alma Media's business newspaper Kauppalehti, has launched two new AvantGo channels for palmtop computer users.
Few have taken them on, these little bits of portable electronic content that one can read on a gizmo devoted to the purpose, or on a palmtop computer, or on a standard PC.
Today the WAP phone; tomorrow the PDA, the personal digital assistant that enlarges the now traditional mobile-phone screen into a palmtop computer.
A dismounted soldier with a palmtop computer and a computer card may be able to share his view of a battle with ships offshore as well as vehicles such as tanks and high mobility multipurpose wheeled vehicles.
Psion Plc, the London-based palmtop computer maker and software developer, has produced a predictably dismal set of financial results as it shares the burden of building up the Symbian joint venture and struggles to avert the decline in sales of its palmtops and industry products.
The US networking firm and palmtop computer producer 3Com Corp has bought the French company Smartcode Technologie to develop an Internet access technology for the cellphone market in Europe for USD17.5 million (Euro 15.86 million).
Phone, comb, reporter's pad, pen, purse, palmtop computer.