A word used to describe a system or a mode of working in which there
is a response to operator instructions as they are input. The instructions may
be presented via an input device such as a keyboard or light pen, and the effect
is observable sufficiently rapidly that the operator can work almost
continuously. This mode of working is thus sometimes referred to as
conversational mode. An interactive system for multiple users will
achieve the effect by time sharing. See also multiaccess system.