Laura spoke to the concept of interactivity.
The gating step is how much data can be delivered how fast over what system to the destination.
I look back ten years ago and Netscape was the rage. My customers changed markedly from 1990 to 1996. In 1990, they were mostly software oriented people who could pop the top of a computer and fix stuff as fast as Gyro Gearloose, could.
Ten years before that, most computers with any power were the size of a refrigerator and word processing was something that required a special set of hardware - and Wang was its name. Color laser printers, digital cameras, flat panel monitors, search engines, web cafes - the concepts ranged from Buck Rogers to the incomprehensible.
The other day a news reporter told how some students were tapping out text messages on their cellular phone - while in their pockets, no less - and sending schoolmates answers to questions during a test. This has led to some schools to contemplate a policy of banning all cellular communication - especially, phones.
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