HPF v1.26
I've got a feeling that HPF may be the acronym for "Hendrik Path Finder", a great path finding snippet that was built by Hendrik Felix Pohl (aka Superku), one of the best Gamestudio coders in the universe.
The code comes with a fully functional demo. Superku has updated his path finding code several times so far, making sure that it works flawlessly.
Simply run the test.c script to see the code in action.
The Gamestudio community thanks you for the great contribution, Superku!