It wasn't long before everyone was making their own, virtual, appearance in Doctor Who as "green screen" technology allowed them to be placed in the set alongside the stars.

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Back in 2001 the company created a process called Green List to screen the chemicals in their products and substitute them with environmentally friendly alternatives.

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And we happened to be filming in Toronto, which had just started its own green screen initiative.

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In addition to individual computer stations, there is a green screen, editing room and music mixing station for them to create their own videos.

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The infrared part of the navigation system projects a green image of the terrain on to a screen in front of the pilot.

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The crude green screen interface had fields that needed to be filled in for show titles and genres (effectively turning what would have been text into valuable metadata data about the data) as well as three summaries of different lengths for each show.

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After a brief spray of notes, a white scrim fell, revealing the band members, each wearing a skintight bicycling outfit covered with luminescent white lines in a grid formation, as if they were being tracked on a green screen for later animation.

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The screen is on show at the the FPD International Green Device 2010 trade-show in China, and is displayed naked alongside versions in a prototype "e-reader" and a small notebook.

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This screen also replaces the confusing green-tinted radarscopes that used to adorn cockpits by overlaying (in some configurations) weather and traffic information on the map.

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