Shaderbuilder and Scripts

I have seen and verified that the parameters of a material or shader can be created using scripts to create a preset, and I have two questions:
1. How is this linked to the shader definition file with extension *.sl? On the surface of an object, there may be the parameters, but without the shader *.sl I don’t see how it will work.
2.- Can I get script access to shaderbuilder and create the "User Parameters" block as preset parameters are created?

The scripts I refer to are the samples of "DS3 daz script development kit" for shaders and materials.

Thank you in advance.