Dick Tracy has nothing on the students at The Celebration School near Orlando, Fla. The school has issued its students tiny, wearable personal computers that initially are being used to open locked doors throughout the school.

But there will be many future applications for the decoder-ring-like device developed by Dallas Semiconductor Corp. and based on Sun Microsystems' Java technology, school officials said.

Called iButton, the machine packs a Java computer chip inside a small, but durable, stainless-steel case. The tiny computers are designed to be worn as a ring, watch, dog tag, or key ring and can be used for more than...

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