I am reading Sent and realizing what the tracers (ghosts) are. I have also been wondering if others will be tracers as well, if Chip or Alex interacts with them in a different way than the real Chip and Alex do. For example, if Chip and Alex's tracers go to a party and the real Chip and Alex go to a different party where all of the people from the "supposed to be party" are there. Will all of the tracers from the people at the real party be at the "supposed to party"? I do not think my question will be answered.