The two centralized enterprise data centers host HHC's electronic medical-record system, picture archiving and communication systems, and more than 2,900 clinical and business databases that are used daily by well over 20,000 online users. To improve patient care, these data centers provide computerized physician order entry, which allows medical practitioners to electronically input instructions for the treatment of their patients. Our electronic patient registries monitor and improve the health of diabetic and heart disease patients across the 11-hospital system.