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In the Control Panel go to 'Region and Language', select the tab 'Keyboards and Languages' and click the button 'Change Keyboards...'
The 'Text Services and Input Languages' screen pops up and in it, underneath the language, it says Other -> Ink Correction (64Bit Only). The question is, what does it do?
A bit of googling has lead me to believe it has something to do with tablet PC's and the use of handwriting. I'm assuming tablet PC's have the ablity to interpret hand written text (as by default they do not have a keyboard), and that the way the handwritten letters are interpreted differs from language to language. Maybe Ink Correction can be used to alter this interpretation? I can't think of anything else it could do, would be nice if someone could clarify :)