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Salesforce Click-Through (Referral) Query String?

We'd like to include a hyperlink on our website that points to the Salesforce free trial signup page (https://www.salesforce.com/form/signup/freetrial-lb.jsp), but I can't find any information about how to add a referral to the URL.
My guess (possibly a wrong one) is that we should be including some sort of "referer" information as a query string, so that Salesforce will know the click-through came from our web site... but so far I haven't been able to find anything in the Salesforce documentation about referrals or if / how to add one to an HREF.
This is all a W.A.G. on my part, but I'd think Salesforce would be interested in keeping track of click-throughs and referrals from other sites.  Am I wrong about this?
Jerry H.
Best Answer chosen by Admin (Salesforce Developers) 

The URL of the page that hosts the link is automatically sent as a header parameter (named Referer) by  browser.  So you don't really have to do anything.  Just make sure that the page that hosts the link has a consistent, well-defined URL.