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   An "extent" is a region of text (a start position and an end
position) that is displayed in a particular face and can have certain
other properties such as being read-only.  Extents can overlap each
other.  Lucid Emacs efficiently handles buffers with large numbers of
extents in them.

 - Function: extentp OBJECT
     This returns `t' if OBJECT is an extent.

* Intro to Extents
* Creating and Modifying Extents
* Extent Endpoints
* Finding Extents
* Extent Properties
* Detached Extents
* Duplicable Extents
* Extent Replicas
* Extents and Events
* Atomic Extents

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