@GrizzledGeezer
Open source systems aggregate the most commonplace works in circulation. Sadly these are also the hacked and often abridged versions that are mass-produced to make the content accessible to the lowest common denominator.
Some even come with coloured crayons...
'...how does one "invent" something that's implicit in displaying a text file on a screen?'
Tell this to Apple, Google, Samsung etc, who appear to have found a huge revenue stream in suing each other over exactly that concept...
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