Even with the advent of virtual realities and talking computers, the solution is sometimes a little more basic.
But until Skype fixes it, Kayan suggests that cautious users run the program inside a virtual machine on their computers.
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The flight simulator, for instance, cannot simply download the virtual aircraft from the design computers.
This allows for clever tricks such as concentrating virtual machines on as few computers as possible and switching off the rest to save energy.
Earlier this year a Chinese student in Japan was arrested for using a network of remote-controlled computers to steal virtual items in an online game called Lineage II and sell them to other players.
You need only a fraction of that if you can gin up a virtual supercomputer from thousands of cheap computers.
In the future, surgeons may be able to take an MRI of, say, a liver and duplicate the picture on computers to take a virtual walk through the organ to plan for surgery.
Now that planet-wide network of interlinked computers became a court of the people - virtual Athenian democracy.
As a virtual currency, bitcoins depend on a wide network of closely connected computers to log who holds the coins and where they are spent.
Streams aptX's Virtual CD-Quality Bluetooth music wirelessly when with used with aptX-equipped phones, tablets or computers.
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By renting out cloud-based computers by the hour, companies could run any OS, software or programming language on a powerful virtual machine.
Jaron Lanier has been known for decades as one of the pioneers of virtual reality, and it's very hard to argue his importance in much of the early development of computers, interfaces, and the World Wide Web.
Although Dr Biles has played several gigs with GenJam under the billing of the Al Biles Virtual Quintet, he thinks that the visual impact of a live concert means that however good they get, computers will not put jazzmen out of work.
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