For the present purpose it is sufficient to characterize the MAC system as one which permits an individual to operate a full scale computer from a remotely located typewriter. What is important here is that the computer can read messages typed on the typewriter and respond by writing on the same instrument. The time between the computer's receipt of a message and the appearance of its response is a function of the program controlling the dialog and of such MAC system parameters as the number of users currently corresponding with the system. These latter parameters generally contribute so little to the overall response time that conversational interaction with the computer need never involve truly intolerable delays. Only the question mark may not be used, because it is interpreted as a line delete character by the MAC system.
Control is then again with the user.
They're always bugging us about something or other. Well, my boyfriend made me come here. He says I'm depressed much of the time. I need some help, that much seems certain. Perhaps I could learn to get along with my mother.