Customize application with paraview's framework

Much thanks for your detailed explaination, Mathieu.

I learnt that PV has its definitions for algorithm from ParaviewGuide.pdf(e.g RequestData, RequestInformation), I think this mechanism fits me.
But what do you mean

custom application framework

I see only “customizing paraview”, which is about altering PV’s preference, other than “customize application”. I hope for more details about it.

Thanks for your help!