question:  What does the viviscreen do?
context: What with red-spot fever, talking cockatoos and flagpole trees, I was running in circles—especially since Grannie became twins every now and then. Everything else was blanketed by the sand and the powerful wind that blew from all quarters. If my calculations are right, we've hit it at its narrowest spot." He could be excused this time, however, for this was only our third day on Jupiter's Eighth Moon, and the country was still strange to us. I'm not up on the scientific reasons, but it seems that life on the red planet has developed with a supersonic method of vocal communication. The Martian speaks as the Earthman does, but he amplifies his thoughts' transmission by way of wave lengths as high as three million vibrations per second. "But up until now this moon is the only place where it can be found. "There are two companies here," he continued, " Interstellar Voice and Larynx Incorporated . So now here we were at the outer reaches of the Baldric, four travelers on foot with only the barest necessities in the way of equipment and supplies. Above us, the great disc of Jupiter began to descend toward the horizon. We walked after that with taut nerves and watchful eyes, but we saw no repetition of the "mirage." "It's a kite," she nodded. She offered no further explanation, but a quarter of an hour later as we topped another rise a curious elliptical car with a long slanting windscreen came into view. Attached to its hood was a taut wire which slanted up into the sky to connect with the kite. Occasionally he touched a stud on an electric windlass to which the kite wire was attached. Apparently these adjustments moved planes or fins on the kite and accounted for the car's ability to move in any direction. "They walk out into the Baldric," he continued, "and nothing can stop them. Fully two hundred cockatoos were perched upon it.
output:  It brings up a 3-D image of the person you are looking at and allows you to watch and hear them as if you were there.
options:  It plays a recording of something. In this case, it's of Grannie, Xarnal, and Jimmy Baker.  It's stationary, and can only be used to view one place and time.  It brings up a 3-D image of the person you are looking at and allows you to watch and hear them as if you were there.  Like a computer or television screen, it allows you to see another person on the other end.