This chapter is about the introduction and use of the communication tool C2000 and the Integrated Emergency center System (GMS) at the emergency center ‘Hollands Midden’ in the Dutch city of Leiden. ‘Hollands Midden’ is a co-located emergency center that physically houses the police, medical and fire brigades' emergency center personnel at one site. The introduction of these systems at ‘Hollands Midden’ was part of a nationwide introduction of new technologies in emergency centers in the Netherlands. We studied how C2000 and GMS tie the various information elements together in the back office of the emergency center. In addition, we used Giddens' structuration theory to understand how, in the reality of the emergency centers, rules, norms and behavior come into being through the use of the new technologies and how the new technologies are (re)shaped by the actors. What we found is that C2000, once introduced as a promising communication tool, is not (always) used as it was designed to be. And GMS, the system that was supposed to integrate the most important routines of the emergency center, has undergone constant change at ‘Hollands Midden’ as a result of local needs and adaptation. Coping with co-location: Implementing C2000 and GMS in the Dutch police region ‘Hollands Midden’.