In this paper, we discuss a re-configurable pipeline architecture that is ideally suited for applications in which a user is interactively managing a stream of data. Currently, document service buses allow stand-alone document services (translation, printing, etc.) to be combined for batch processing. Our architecture allows services to be composed and re-configured on the fly in order to support interactive applications. To motivate the need for such an architecture we address the problem of

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... nding and organizing images on the World Wide Web. The resulting tool, PicturePiper, provides a mechanism for allowing users access to images on the web related to a topic of interest.