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A "position" is the index of a character in the text of buffer.
More precisely, a position identifies the place between two characters
(or before the first character, or after the last character), so we can
speak of the character before or after a given position. However, the
character after a position is often said to be "at" that position.
Positions are usually represented as integers starting from 1, but
can also be represented as "markers"--special objects which relocate
automatically when text is inserted or deleted so they stay with the
surrounding characters. Note: Markers.
- The special position where editing takes place.
- Changing point.
- Temporary motion and buffer changes.
- Restricting editing to a portion of the buffer.
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