A question of perspective

For week 2, Open University’s H809 has set an impossible task: "Think back over the past 25 years or so, and try to agree in your tutor group upon a timeline of the available digital technologies in education." Now, my tutor group consists of practitioners in a number of different countries. Some of them live in the better-off parts of their countries, others live in cities or towns with more restrained budgets. People work with different populations: school, university, etc. Now, I’m fairly certain I can find out when a specific technology became available for secondary schools within Aachen – as long as I am willing do define "available" as "they have this stuff in one or several of their classrooms" instead of "it’s regularly used" or "it's used sensibly" (a much more difficult question). I don’t think agreement is in any way possible. Are interactive whiteboards "available" now? For elementary students in Tokyo? For grammar school students in the rural Eifel region? For girls as well as for boys? For teens taking biology classes as well as for those who prefer physics classes? For those at private or those at public schools?
No clear-cut, timeline-friendly answers here, I'm afraid.