Is there a handbook where all script functions and data types are listed with descriptions of their parameters, what they do and how they work?
With examples of use preferably.
A handbook like handbooks for compilers, that teach you how to program with them.

All the functions and data types have loads of comments in the header files, so that's a start.
As for learning how to program with them: There are loads of tutorials, plus these forums.

So no handbook, no user manual, no reference guide, no html help file? Pity.(
It would be a good thing to assemble one in order not to search for information in different tutorials and headers.
I am used to use such things for help when programming.

Oh yes, this too: http://www.esenthel.com/?id=doc

Ahh, forgot about it.
Some documentation after all.
Thank you for reminding.