Wow BMS/EMS can be a lot of things: security system, building management system, energy management system, automation system, but one of its main features is being a security system.  Security systems monitor and control devices like Access Control, Cameras, Intrusion, Fire Alarms, Elevators, to name a few.  This requires a responsive system with alarming capabilities like Email, messages on your mobile, and workstations, with the ability to document events/alarms and notify the proper authorities.