DIGITAL STEP-IN

Controlled audio and video apparatus and fittings therefor, namely, electric, electronic, matrix and video-audio signal switches, audio and video processors, microphones, loudspeakers and display screens for producing and selectively transmitting audio and video in enclosed spaces; software for controlling audio, video and projecting accessories and computers in a classroom, boardroom, conference room and auditorium, enabling selective connection of input sources of audio and video signals, such as laptops and DVD's, for providing an interface and facilitating connection and controlled display of a plurality of such sources