1. A method for displaying an image on a display screen corresponding to information stored in a data processing system memory, wherein the stored information contains a predetermined first density of dot detail resolution, comprising: extracting from said stored information a first subset of information representing the complete image but containing a second density of dot detail resolution less than said first density; extracting from said stored information a second subset of information representing a selected portion of said complete image, said second subset containing a third density of dot detail resolution greater than said second density but not greater than said first density; forming a split screen display containing discrete first and second display areas; and using said first and second extracted subsets, forming simultaneous coarse and fine resolution displays in said respective first and second areas of said respective complete image and selected portion thereof.