The ACTpro 4000 two- door controller from Access Control Technology (ACT) Ltd has been designed to suit installations where the traffic volumes are large and changes to the card holder database are a daily occurrence. Networkable to up to 4,000 doors the ACTpro 4000 can manage up to 60,000 users and changes to large databases can be affected up to ten times faster than previously. Installation has been simplified by the inclusion of an auto-discovery button in the ACTWin 2.8 software. When this is pressed all the controllers and door stations on the network are located. The installer can view the controller configuration and verify network communications via a specially designed controller status web page.