You can also type @kbd{M-&} (@code{async-shell-command}) to execute a
shell command asynchronously; this is exactly like calling @kbd{M-!}
with a trailing @samp{&}, except that you do not need the @samp{&}.
-The output buffer for asynchronous shell commands is named
+The default output buffer for asynchronous shell commands is named
@samp{*Async Shell Command*}. Emacs inserts the output into this
buffer as it comes in, whether or not the buffer is visible in a
window.
+@vindex async-shell-command-buffer
+ If you want to run more than one asynchronous shell command at the
+same time, they could end up competing for the output buffer. The
+option @code{async-shell-command-buffer} specifies what to do about
+this; e.g., whether to rename the pre-existing output buffer, or to
+use a different buffer for the new command. Consult the variable's
+documentation for more possibilities.
+
@kindex M-|
@findex shell-command-on-region
@kbd{M-|} (@code{shell-command-on-region}) is like @kbd{M-!}, but