This is a trick where you modify the link syntax to target keywords and tail end keywords. example http://forums.digitalpoint.com?=cool-little-tip http://forums.digitalpoint.com?=target-keyword http://forums.digitalpoint.com?=long-tail-end-keyword And you would put out the links like this with anchor text Cool Little Tip Target Keyword Long Tail End Keyword I think you can see the power of this neat little trick... In regards to building backlinks and targeting specific searches in the search engines.
http://forums.digitalpoint.com/taget-keyword.htm is better then php globals source: seo ranking factors 2009