 What does the viviscreen do?
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. If that vein holds out, we'll double the output of Interstellar Voice , our rival, in a year." Those colors whirled kaleidescopically, then coalesced into a three-dimensional scene. It was a scene of a rapidly unfolding desert country as seen from the rear of a kite car.
 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.
 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.