It appears that the sonos system relies on a network broadcast to add components to the system. Unfortunately, this limits the system to a single IP subnet. Could enhancements be made to the compnents and software to allow for the system to exist across multiple subnets? Think of this as an advanced configuration for system administrators to do and not your average home/small business user. This would enable the sonos system to be utilized through enterprise deployments where multiple locations all have wide area network connectivity which would allow for control of all of the offices from a centralized location. Furthermore, additional basic security could be added to perhaps limit access to rooms.