The science behind the teleportation device that the Moonreaver House had created was quite simple. Firstly, two points in the fabric of Space had to be connected together via waypoints. Usually, the waypoints were nothing more than a device that the Moonreaver technicians had installed.
Next, using stored magic power, the two waypoints would establish a connection, requiring the two operators from either side to be in sync. Funnily enough, Vampires used satellite technology that man had created to establish this communication line.
Finally, once the connection had been established and the two points in Space were connected, a spatial wormhole would be created, allowing anyone to pass through.