Hello Ricardo,
This is because these function calls are context dependent and are automatically placed, based on which field, collection, function or variable you have selected.
As an example, this:
Turns into this:
You could theoretically use app.get_field_value() directly, though there really is no point as you would then need to resolve the required placeholders yourself. The same is true for the others.
Every function call that you would directly use, is documented with context help. I am pretty certain we have 100% coverage, but if you find one missing, please let us know.
When we have the time, we plan to remove even more functions from the list (such as app.form_open()) by offering a user-friendly wizard, where you can select things from menus instead of manually providing IDs. Not all function calls would work like this, but it would make using those functions easier.
