Most Americans have heard of OnStar, the in-car communications, security and diagnostics system, but many of them are not aware of its long laundry list of features nor how to go about obtaining it. What vehicles offer OnStar? What services does it offer? What do those services cost? Can I get OnStar in my used vehicle? Kelley Blue Book's Executive Editorial Director Jack R. Nerad sat down with OnStar Vice President of Sales and Marketing Tony DiSalle to get answers to those questions and more as part of kbb.com's special look behind the scenes at OnStar.