INSTEON is a home automation hardware standard developed by SmartLabs. If you're unfamiliar with INSTEON, you might want to read up on how INSTEON links work. Manufacturers of INSTEON compatible products are:
You may want to check out an overview of how to define an INSTEON device in Indigo. Check out the Insteon section of our supported devices list for a good list of all Insteon devices Indigo supports.