A station utilizing radio waves in experiments with a view to the development of science or technique. This definition does not include amateur stations. [NTIA] [RR]

A computer system that facilitates solving problems in a given field or application by drawing inference from a knowledge base developed from human expertise.
Note 1: The term "expert system" is sometimes used synonymously with "knowledge-based system," although it is usually taken to emphasize expert knowledge.
Note 2: Some expert systems are able to improve their knowledge base and develop… (Read More →)

A message generated by the network and sent to the user terminal to indicate a congestion condition. [T1.615-1992]

Services that can be accessed from an application program, via an API, and are generally provided only when requested [POSIX.0].

Synonym mail exploder.

1. [A] Channel that allows the violation of the security policy governing an information system (IS) and is usable or detectable by subjects external to the trusted computing base. [INFOSEC-99]
2. Any channel that is usable or detectable by subjects external to the Trusted Computing Base.

Any outside plant facilities subject to the effects of lightning; or to power contacts, power induction, or differences in ground potential any of which exceed 300 Vrms to ground. [T1.316-1997]

In INFOSEC, the potential compromise associated with an attack exploiting a corresponding vulnerability. [2382-pt.8]

A permanently connected voice circuit between selected stations for technical control purposes.

An ACL that contains other entries in addition to the required entries [POSIX.6].