Forget about Bruce Springsteen the iconic rock star. Forget about the Bruce Springsteen the winner of countless Grammy Awards, an Oscar and, as of last week, a Presidential Medal of Freedom. And forget about Bruce Springsteen the harmonica-slinging folk hero who channels Woody Guthrie. Because the man who appeared at Denver’s Tattered Cover Book Store on Wednesday was Bruce Springsteen, the lauded author whose writing — not his guitar — does the all the talking. Of course, the nearly 1,200 fans who lined up outside for a chance to own a signed copy of “Born to Run” and a photo with Springsteen have not forgotten any iteration of the man known as the Boss. After the September release of his hefty autobiography, the length of which is rivaled only by the raucous four-hour-plus shows he puts on, Springsteen has launched a book tour visiting a select cities, meeting and greeting the lucky few with tickets and time. There are plenty of rockers who put pen to paper, producing memoirs full of sleazy bars and cheap motels and then hitting it big — only to experience the seemingly inevitable drug-fueled or disease-induced crash. Here, Springsteen stands apart.