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You can use overlays to alter the appearance of a buffer's text on the screen, for the sake of presentation features. An overlay is an object that belongs to a particular buffer, and has a specified beginning and end. It also has properties that you can examine and set; these affect the display of the text within the overlay.
38.9.1 Overlay Properties How to read and set properties. What properties do to the screen display. 38.9.2 Managing Overlays Creating and moving overlays. 38.9.3 Searching for Overlays Searching for overlays.
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