)(n.) An extremely lightweight personal computer. Notebook computers typically weigh less than 6 pounds and are small enough to fit easily in a briefcase. Aside from size and portability, the principal difference between a notebook computer and a personal computer is the display screen. Notebook computers use a variety of techniques, known as flat-panel technologies,to produce a lightweight and non-bulky display screen.
The quality of notebook display screens varies considerably. Many notebook display screens are limited to VGA resolution. Active-matrix screens produce very sharp images, but they do not refresh as rapidly as full-size monitors.
In terms of computing power, modern notebook computers are nearly equivalent to personal computers. They have the same CPUs, memory capacity, and disk drives. However, all this power in a small package is expensive.
Notebook computers come with battery packs that enable you to runthem without plugging them in. However, the batteries need to be recharged every few hours.
- null-modem cable
A specially designed cable that allows a user to connect two computers directly to each other via their communications ports (RS-232 ports). Null modems are particularly useful with portable computers because they enable the portable computer to exchange data with a larger system. Null modem cables have the Tx (transmit) and Rx (Recieve) lines crossed […]
In database management, a field that is allowed to have no values is called nullable. Depending on the application, nullable may also be called a null reference or null object.
- number cruncher
(1) A computer whose dominant characteristic is its ability to perform large amounts of numerical computations quickly. Supercomputers, for example, are sometimes called number crunchers. In addition, the term number cruncher is often applied to powerful workstations. (2) The term number cruncher is sometimes applied to programs. For example, statistical programs are number crunchers because […]
- numeric keypad
)A separate set of keys on some keyboards that contain the numbers 0 through 9 and a decimal point arranged as on an adding machine. Numeric keypads make it easier to enter large amounts of numeric data. Frequently, the keys on the numeric keyboard also serve as cursor control keys. Their meanings, therefore, depend on […]
A shortened form of the word pseudonym, a nym is an anonymous invented name that a person can use in e-mail or in online discussions arenas, such as chat rooms or newsgroups. Some people create nyms because they want to protect their privacy on the Internet, while others create nyms to keep from being identified […]