> the focus of the industry has moved from mainframes to minis to PCs and now to mobile
The shift from mainframes/minis to PCs couldn't happen until PCs gained the ability to use LANs and client/server networked applications, which enabled the PCs to perform all the tasks that mainframes/minis were previously used for. Similarly, mobile-class computing devices may be able to displace PCs eventually, but not until they can be used to do all of the tasks for which PC-style human-interface devices (particularly large monitors, keyboards, and mice, and optionally other things like high-quality speakers, game controllers, etc.) are a practically necessity.
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