er than <I>via</I> a socket-like interface.
    <LI><A HREF="../concepts/closable.html">Closable:</A> A Filter or Device which receives notifications immediately before a stream is closed.
    <LI><A HREF="../concepts/flushable.html">Flushable</A> A Filter or Device which receives notifications when a stream is flushed.
    <LI><A HREF="../concepts/localizable.html">Localizable:</A>  A Filter or Device which receives notifications when the <CODE>locale</CODE> of a stream or stream buffer is set using <CODE>