This article investigates exchanges between the presenter and another participant within PowerPoint presentations in workplace meetings. Using ethnomethodological conversation analysis as a method, it examines 1) how participants orient to each other's expertise, 2) what is accomplished through the exchange and 3) how the PowerPoint slide is interwoven with the process. The results show how the exchanges establish the presentation as information delivery in which the complexity of professional knowledge is displayed and negotiated. Moreover, there is an orientation to directive functions of the presentation activity. The PowerPoint slides as a text and as a material object are evoked for these purposes.