It is a thick programming manual called "~ATH - A HANDBOOK FOR THE IMMINENTLY DECEASED."
~ATH is an insufferable language to work with. Its logic is composed of nothing but infinite loops, or at best, loops of effectively interminable construction.
The above page in the intro section documents the simplest possible ~ATH code structure. Any code deviating from this basic structure will not compile.
You have a whole bunch of code samples you've been messing around with on your computer. It's been frustrating at best, and debilitating to your machine at worst.