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TrackBacks are a new ISP technology; they are special messages used by bloggers to reference each others' blogs. When a blogger writes about someone else's blog, she sends a TrackBack to the blog she's referencing. The referenced blog receives the TrackBack and can inform the author and/or back link to the referencing blog if it so chooses; dynamic Web servers often do all the work without any human intervention. TrackBacks are a specialized type of ISP service and not every ISP provides them. Usually ISPs geared for hosting blogs provide TrackBack capabilities.