Reciprocal Link Validation

Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/69bce3ce3504ac66#

Do we have any subject describing how it works exactly?

I'd have some questions:

• does the backward link need to be on homepage of link owner's website?
• does the validation pass successfully when this is a deep link ( http://website.com/subfolfer/page.html ) ?