See dual-tone multifrequency (DTMF) signaling.

Pertaining to a device that allows a user to interact with a computer system by touching an area on the surface of the device with a finger, pencil, or other object; for example, a touch-sensitive keypad or screen.

Technical Report

In a packet-switching network, a unique packet that causes a report of each stage of its progress to be sent to the network control center from each visited system element.

A computer program that performs a check on another computer program by exhibiting the sequence in which the instructions are executed and usually the results of executing the instructions.

Property of the development of a system that allows requirements to be traced from one representation to another [CESG].

On a data medium, a path associated with a single read/write head position as data move past the head.

The number of tracks per unit length, measured in a direction perpendicular to the direction in which the tracks are read.

A ball that can be rotated about its center and that is used as an input device, e.g., to position a cursor. Synonym control ball.

The deviation of a dependent variable with respect to a reference function.