Product fields not fully documented

This page seems to define what some of the fields are but not all of them.
http://thecartpress.com/docs/working-with-the-thecartpress/creating-products/

I need to know the difference between initial stock and stock. I know that may seem silly but they seem to be redundant to me and I’d like to know for sure what the difference is with out having to dig through line after line of code.

http://ww.wp.xz.cn/extend/plugins/thecartpress/