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IanTurner - 4:20 pm on Dec 20, 2011 (gmt 0)
Most http programs have a way of setting the referrer - a simple command line bat file or cron job using wget is all you need at the simplest level.
If you use one of these to go to a site with the HTTP Referer header set to your site or a page on your site - you don't actually need a link on that page to the target site.