Three-Way Link Exchange A three-route unite carry is a Reciprocal Link Exchange established between three domains. However, unlike a two-system unite transfer, not every three sites unite to each other. Page A links to Page B and Page B links to Page C and Page C links to Page A. Page B does not post a reciprocal unite to Page A and Page C does not post a reciprocal connect to Page B. Three-system unite exchanges are used by owners of multiple websites to increase the Link Popularity and Page Rank of novel or smaller sites.