Calculator .. the 'o' key?? Mathematicians ...?

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10 Dec 2008
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Load up calculator on Windows (start --> run 00> calc). Don't press any numbers.

Press the letter 'o'

the number '1' appears (!!)

Press the letter 'o' a load more times. A different sequence of numbers appears for a while, then stops!.


For 10 points and a chance to go for the car, what does the 'o' button do in the application 'calculator' in windows? I ain't got the foggiest!
 
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