The first of a special three-part presentation in which American film director Billy Wilder discusses his career with German film maker Volker Schlondorff. From Marlene Dietrich to Marilyn Monroe. Humphrey Bogart to Gary Cooper , Wilder has directed the film industry's greatest legends. Normally a private man, tonight he reminisces about his early years in Hollywood with fellow emigres Fritz Lang and his mentor, Ernst Lubitsch (the programme's title is derived from a sign in Wilder's office which asks: "Lubitsch, how did you do it?"), and describes working with Dietrich on his emotional return to post-war Berlin.