This was revolutionary when it was introduced five years ago, such that many people doubted the utility of a virtual keyboard.

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For years, we had a virtual monopoly on the business down there and one day a competitor asked the Mexican state utility why we always got the job.

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"Because virtual worlds like Second Life do not impose language barriers like the web does - that almost certainly means their ultimate utility range is larger, " he said.

BBC: NEWS | Technology | A very real future for virtual worlds