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In addition to the primary selection, the X Window System provides a second similar facility known as the secondary selection. Nowadays, few X applications make use of the secondary selection, but you can access it using the following Emacs commands:
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 selected text is highlighted, using
the secondary-selection
face, as you drag. The window scrolls
automatically if you drag the mouse off the top or bottom of the
window, just like mouse-set-region
(see Mouse Commands).
This command does not alter the kill ring.
Set one endpoint for the secondary selection
(mouse-start-secondary
).
Set the secondary selection, with one end at the position clicked and
the other at the position specified with M-mouse-1
(mouse-secondary-save-then-kill
). This also puts the selected
text in the kill ring. A second M-mouse-3 at the same place
kills the secondary selection just made.
Insert the secondary selection where you click, placing point at the
end of the yanked text (mouse-yank-secondary
).
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, or even
which of the frame’s windows you click on. See Mouse Commands.