19. An interactive terminal as defined in claim 18, wherein said shift means incorporate shift level control keys, the number of shift level control keys at least equal to the number of information levels minus 1.
19. An interactive terminal as defined in claim 18, wherein said shift means incorporate shift level control keys, the number of shift level control keys at least equal to the number of information levels minus 1. 20. An interactive terminal as defined in claim 19, further comprising a three-position scroll switch communicating with said memory for presenting on said display data held in said memory, having a normal position for displaying data as received, a scroll retrieval position for sequentially displaying data held in said memory, and a scroll position for holding data on the display.