From Bosch Security Systems the D6201-USB NetCom security key (dongle) allows the D6200 programming/administration software for the D6600 NetCom System to communicate with multiple D6600 Receivers running NetCom firmware. This security key allows for a maximum of 3,200 accounts and plugs into a USB port. End users now have a choice of security keys, one for parallel ports, the D6201 NetCom security key, and one for USB ports, the new D6201-USB.