"Session ends"?

[Eli Zaretskii <eliz@gnu.org>]

> diff --git a/doc/lispref/frames.texi b/doc/lispref/frames.texi
> index bae8eb3..38897d6 100644
> --- a/doc/lispref/frames.texi
> +++ b/doc/lispref/frames.texi
> @@ -4038,6 +4038,35 @@ Drag and Drop
>  still no match has been found, the text for the URL is inserted.  If
>  you want to alter Emacs behavior, you can customize these variables.
> 
> +@cindex initiating drag-and-drop
> +  On some window systems, Emacs also supports dragging contents from
> +itself to other frames.
> +
> +@defun x-begin-drag targets action &optional frame
> +This function begins a drag from @var{frame}, and returns when the
> +session ends, either because the drop was successful, or because the
   ^^^^^^^^^^^^

"When the session ends"?  You mean, this function will not return
until I kill Emacs?  Or what "session" is alluded to here?