This article presents two examples of how call operators become involved in handling of cases within an emergency service center. The focus is on how the way operators talk and use artifacts in the room support that other operators become involved in the handling of the cases. The background to the field study is an ongoing project that develops a new Computer Aided Dispatch. One of the functions of interest in this new computer system is call distribution. This involves thinking of letting operators at different service centers cooperate and share cases across distance. It is argued that the way the operators talk and use artifacts inside the present shared room are to be considered in the design of the future computer system. It is also argued that those themes are important when dealing with the design of call distribution.