+Lisp functions that manipulate processes usually accept a @var{process}
+argument. Besides using an actual process object for this argument, you
+can use a process name, a buffer object, the name of a buffer, or
+@code{nil}. Specifying a buffer or buffer name for the @var{process}
+argument means use the process associated with the buffer (or the most
+recent one, if there is more than one). @code{nil} means use the
+process associated with the current buffer.
+@xref{Process Information}.
+@xref{Process Buffers}.
+