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(emacs)Secondary Selection

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Secondary Selection
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   The "secondary selection" is another way of selecting text using X.
It does not use point or the mark, so you can use it to kill text
without setting point or the mark.

`M-Drag-Mouse-1'
     Set the secondary selection, with one end at the place where you
     press down the button, and the other end at the place where you
     release it (`mouse-set-secondary').  The highlighting appears and
     changes as you drag.  You can control the appearance of the
     highlighting by customizing the `secondary-selection' face (Note:
     Face Customization).

     If you move the mouse off the top or bottom of the window while
     dragging, the window scrolls at a steady rate until you move the
     mouse back into the window.  This way, you can mark regions that
     don't fit entirely on the screen.

`M-Mouse-1'
     Set one endpoint for the "secondary selection"
     (`mouse-start-secondary').

`M-Mouse-3'
     Make a secondary selection, using the place specified with
     `M-Mouse-1' as the other end (`mouse-secondary-save-then-kill').
     A second click at the same place kills the secondary selection
     just made.

`M-Mouse-2'
     Insert the secondary selection where you click
     (`mouse-yank-secondary').  This places point at the end of the
     yanked text.

   Double or triple clicking of `M-Mouse-1' operates on words and
lines, much like `Mouse-1'.

   If `mouse-yank-at-point' is non-`nil', `M-Mouse-2' yanks at point.
Then it does not matter precisely where you click; all that matters is
which window you click on.  Note: Mouse Commands.