Need help understanding Painter Remote control with scripting

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I am trying to understand how this works
https://substance3d.adobe.com/documentation/spdoc/remote-control-with-scripting-216629326.html

Right now I am using a python script to run a command line to open up Painter and import an FBX.  

I am trying to understand what I can actually do with remote control with scripting.  Does that allow me to access python modules inside of a Painter?  Or does it allow me to just run python from outside Painter?  I see it says I can pass in this paramater (--enable-remote-scripting) when i run my command line, but unsure what I do from there and how that relates to the lib_remote.py and the example they give. 

Thanks

Craig