Here, therefore, I w i l l merely mention some areas in which such exchanges may be useful. There appear to be two sorts of status for machine/technology under consideration here. In one, the interactants themselves are humans, but the interaction between them is carried by some technology. W have had the t e l e ephone for about lO0 years now, and l e t t e r writing much longer, so there is a history here; to i t are to be added video technology, as in some of the work reported by John Carey, or.
