The document discusses various codes and conventions commonly used in film opening sequences. It outlines several elements film openings typically include to engage audiences and set expectations for the genre, such as logos from major film studios, title graphics that convey the film's title and credits, the use of sound, imagery and details to establish the setting and introduce characters or themes. Common techniques involve narration, enigmatic elements to intrigue viewers, establishing shots that orient viewers to the location, and including action or chase scenes for action-oriented films. The purpose is to attract and inform viewers about the key elements of the film in the opening moments.