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<a href="/global/siteframe.asp?returnurl=links.htm&mainurl=http://www.domainname.com">Anchor Text</a>
That is the code used to call up my site within the frame of the site 'linking' to me. At first, I thought Google was pulling url's and giving credit for the link just from that code. However, the only pages which receive credit from this page (with about 50 offsite links) are those that have a full http link on their framed page.
However there are other advantages of putting the full HTTP ref in - for example, if somone saves your page to hard disk and later wants to revisit your site its easier for them to click on the full http ref logo than to spend time wondering what the URL was.