A great article about K is <a href="http:&#x2F;&#x2F;archive.vector.org.uk&#x2F;art10501320" rel="nofollow">http:&#x2F;&#x2F;archive.vector.org.uk&#x2F;art10501320</a> - it introduces K as a magical, end-all programming language that is blazingly fast and would solve lots of problems...if only someone other than the author understood it.<p>As I understand it, the original K is closed-source and no one has really used it. All the derivative languages were reverse-engineered from programs and descriptions, and it spun into it&#x27;s own family of APL-like languages. As far as I know, at least.