A method and apparatus for visually comparing two files or portions thereof by visually indicating to the user areas of identity and differences between the items being compared. The items are stored in a video RAM which controls the visual presentation on the screen. The respective pixel settings in...http://www.google.com/patents/US5142619?utm_source=gb-gplus-sharePatent US5142619 - Method and apparatus for visually comparing files in a data processing system
