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   Emacs "registers" are places in which you can save text or positions
for later use.  Text saved in a register can be copied into the buffer
once or many times; a position saved in a register is used by moving
point to that position.  Rectangles can also be copied into and out of
registers (Note: Rectangles.).

   Each register has a name, which is a single character.  A register
can store either a piece of text, a position, or a rectangle, but only
one thing at any given time.  Whatever you store in a register remains
there until you store something else in that register.

* RegPos
Saving positions in registers.
* RegText
Saving text in registers.
* RegRect
Saving rectangles in registers.
`M-x view-register RET R'
     Display a description of what register R contains.

   `M-x view-register' reads a register name as an argument and then
displays the contents of the specified register.

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