ByPic is a powerful language that works at register level. It is intended that the user builds up a library of functions specific to the project at hand, this is the concept of ByPic.
Following in that vein, the software provided here is a set of functions that will make the tutorial much easier to do; the project in this case is the tutorial so it is in keeping with the ByPic philosophy.By using this software no knowledge of the registers is needed for most of the projects.
As this makes common tasks easier it may be an idea to keep this in flash all of the time for your own projects. The only reason that you may want to get to the registers directly is for performance or space reasons.
The software and what it does is fully described in the rookie library page.
The installation process is now fully described in Part 3 of the tutorial using the new IDE