pts/output_filter.html">OutputFilter</A>, which Filters output written to a Sink. Sources, Sinks and their refinements are called <SPAN CLASS="term">Devices</SPAN>. InputFilters, OutputFilter and their refinements are called <SPAN CLASS="term">Filters</SPAN>.
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    Standard streams and stream buffers are Devices; for example, input streams are <A HREF="../concepts/source.html">Sources</A> and output streams are <A HREF="../concepts/sink.html">Sinks</A>.<A CLASS="footnote_ref" NAME="note_1_ref" HREF="