The purpose of this subchapter is to provide for the establishment of mutual consent voluntary adoption registries through which adoptees, birth parents, and biological siblings may voluntarily locate each other. It is not the purpose of this subchapter to inhibit or prohibit persons from locating each other through other legal means or to inhibit or affect in any way the provision of postadoptive services and education, by adoption agencies or others, that go further than the procedures set out for registries established under this subchapter.