append-next-kill is an interactive compiled Lisp function in `simple.el'.

It is bound to C-M-w.

(append-next-kill &optional INTERACTIVE)

Cause following command, if it kills, to add to previous kill.
If the next command kills forward from point, the kill is
appended to the previous killed text. If the command kills
backward, the kill is prepended. Kill commands that act on the
region, such as `kill-region', are regarded as killing forward if
point is after mark, and killing backward if point is before

If the next command is not a kill command, `append-next-kill' has
no effect.

The argument is used for internal purposes; do not supply one.