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This paper derives from a study undertaken at an emergency service centre in Sweden. The studies have focused on features of work familiar to the CSCW community, including the documenting and analysing current work practices, understanding the properties of the technology in question, and perhaps most importantly how the technology functions in and through use. Our focus in this paper exemplifies these themes through the analysis of two cases. In the first, the issue in question is the way in which an emergency is identified and dealt with, it being the case that a typical problem to be dealt with by operators, and more commonly in the days of mobile telephony, is that of multiple reporting of a single case. Of particular interest here is listening-in, which is a function in the Computer Aided Dispatch (CAD) system and by contrast that of 'overhearing', which is not. The second case focus on the relevance of wall …