If you want to see the sort of things it does, watch the following short video - but it is much more fun to interact with the simulation yourself:
If you visit the project's CodePen page. Tearable Cloth, called a pen in the CodePen jargon, then you can run the program to try it out and both examine and modify the code.
No misprint - it really does say caret and not carrot - but it doesn't help explain what a multi-caret is, although multi-carrot would be even stranger. Yes, NetBeans 8.2 is here with some new feature [ ... ]