I don't see how D_AttachmentList configuration can help me with my question.
I want to know if, while called in activity, data page always uses current parameter page if not stated otherwise. E.g. if on my param page param.LinkRefFrom is set to C-12 and I make a property set Primary.pyNote=D_AttachmentList.pyNote, will D_AttachmentList be called with parameter from current parameter page (actually it will, the main question is if this behaviour going to stay between Pega versions e.g. Pega 8).