This paper presents concepts to extend our understandings of bodily aspects of technology interactions. The aim of the paper is to offer a way of looking at the role our haptic and kinaesthetic senses play in experiencing tangibles. We approach this issue by framing it around how our bodies establish relationships with things. Four themes body-thing dialogue, potential for action, actions in space (consisting of within-reach, out-of-reach) and movement expression are introduced. We discuss the role these themes can play in our thinking about, and exploration for, tangible and non-tangible technology interactions. The idea is that these themes can help us consider, not just how a design or a technology might look, but also how it might feel to use.

This paper outlines the design of a web crawler implemented for IBM Almaden's WebFountain project and describes an optimization model for controlling the crawl strategy. This crawler is scalable and incremental. The model makes no assumptions about the statistical behaviour of web page changes, but rather uses an adaptive approachtomaintain data on actual change rates which are in turn used as inputs for the optimization. Computational results with simulated but realistic data show that there is no `magic bullet' - different, but equally plausible, objectives lead to conicting `optimal' strategies. However, we nd that there are compromise objectives which lead to good strategies that are robust against a number of criteria. Categories and Subject Descriptors H3.4 [Systems and Software]: Performance Evaluation (eciency and eectiveness); H4.3 [Communications Applications ]: Information Browsers; G1.6 [Optimization]: Nonlinear Programming General Terms Algorithms, Experimentation, Performance Keywords Crawler, incremental crawler, scalability, optimization # This work was completed while the author was on leaveat IBM Almaden Research Center. Copyright is held by the author/owner. WWW10, May 1-5, 2001, Hong Kong. ACM 1-58113-348-0/01/0005. 1.