Possible duplicate of this post:
Try not to create more than one post for the same thing!
It's difficult to understand what you have when you say "Hype parent page". Do you mean you have a HTML page with more than one Hype document or you have a Hype document with an iframe in it?
IF it's the later, then I showed you the technique of accessing an iframe (widget) within Hype in the other post. If it's the former then Hype has a way of being accessed outside the document (i.e from a separate part of the HTML by using
Is this another Hype document or just HTML?