An alerting system for fire stations utilizes programmable message centers, zone-coded lighting and audio modules to alert only selected personnel for a particular type of emergency, i.e. fire, medical, etc. to decrease response time while reducing stress to remaining personnel who need not be alerted....http://www.google.co.uk/patents/US6535121?utm_source=gb-gplus-sharePatent US6535121 - Fire department station zoned alerting control system
