In an Insteon network, there are no routers or administrative devices. Each device can control (or be controlled) by each other device without any complicated hierarchy of device profiles.
Utilizing Simulcast, a broadcast-like system, Insteon can address hundreds+ of nodes simultaneously and without complicated and expensive signal routing.
Insteon's Statelink technology ensures forwards and backwards compatibility with old, new and future automation devices by placing the onus of compatibility on the controlled device; devices don't need to know anything about one another for successful control.
"Insteon network security is maintained via linking control to ensure that users cannot create links that would allow them to control a neighbors’ Insteon devices, and via encryption within extended Insteon messages for applications such as door locks and security applications, should those applications choose to implement encryption.
Insteon enforces linking control by requiring users to have physical possession of devices, or knowledge of their unique Insteon IDs in order to create links. Firmware in Insteon devices prohibits them from identifying themselves to other devices unless a user either physically presses a button on the device during the installation process or explicitly addresses the device via a central controller. Linking to a device by sending Insteon messages (e.g., from a central controller) requires knowledge of the address of the target Insteon device. As these addresses are unique for each device and assigned at the factory (and displayed on a printed label attached to each device), users must have physical access to the device to read the device address from the label and manually enter it when prompted during installation."