Summary
Phones and computers are converging, but no one knows exactly what the result will be.
Three large companies are vying to produce operating systems for these future devices: software giant Microsoft, 3COM spin-off Palm, and mobile phone consortium Symbian.
So far, PDAs fall into two main categories: clamshells such as the Psion and tablets like the Palm.
Computers may eventually become wearable but several problems will have to be overcome first. These include battery life and user input.
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