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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 ?
AvantGo developed a range of business, news and other information services for palmtop computers. Meanwhile OVID, the medical online information provider, has created a service called OVID@hand for use by physicians during consultations away from their desks.
Manufactured on Atmel's low-cost mainstream CMOS process, the AT73C203 has been developed to provide an integrated solution for portable and handheld applications based on microprocessors that require "smart" power management functions, such as 3G phones, PDAs, Palmtop computers, point-of-sales terminals, 3G modems and others.
The extensiveness of UpToDate's text--occupying 800 MB of the 1G card--and limited speed of palmtop computers often makes this impractical.
Mobile or wireless technology -such as third generation mobile phones and palmtop computers -is set to revolutionise the way people work and live in the next few years.
Alistair Dabbs does a good job of emphasizing the reality that today's digital interface is much more than the standard screen we see on our desktops; interface design encompasses "everything with a screen," including mobile phones, palmtop computers, and handheld devices.
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.
With increased storage capacity and processing power, PDAs have become palmtop computers rather than just electronic organizers.
Muscular, agile thumbs seem to be the payoff for people under age 25 who grew up tapping video games, cell phones, and palmtop computers, reported The Observer newspaper in London.
IDNet AB received a contract for palmtop computers. IMS Data Skara AB received a contract for personal computers for home use.
With software providing the link between multiple locations, facilities can program and collect audit trail data from individual openings on laptop or palmtop computers and unite it in a central master file.
Inmarsat is building a new satellite-based network for the delivery of Internet and intranet content, video on demand, video conferencing, e-mail and local area network access at speeds of up to 432Kb/s, as well as voice communications, almost anywhere in the world via notebook or palmtop computers. The network is planned to be operational in 2004.