How does TWO BONE IK works?

Hello,

could someone pls describe how TWO BONE IK works, because i already looked inside the kismet math lib but i didnt know which source codeTWO BONE IK exactly use. Ive also tried some tutorials one youtube about IK but they where pretty complicated and I think the source code of TWO BONE IK is a easier.

p.s. Sorry for my bad english

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