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 over, thereby allowing data to be sent from one device to the other. They are similar to a crossover cable where it is the CTS (clear to send) and RTS (ready to send) lines are crossed over. Null-modem cables are used for serial port connections.
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 […]
- nym server
A computer that allows a subscribing user to send and receive e-mail messages using a nym, or assumed name, without revealing the user’s true identity.