I'm an X10 veteran getting started with Insteon equipment. Just wondering how the protocal works. Suppose I have a tabletop controller linked to a lamplinc "L". If I hit the on button, does it work like X10 where the transmitter says simply "Button 'B' pressed", then the lamplinc gets the message and thinks "Button 'B' has been pressed, that means I'm supposed to turn on." Or does it work the opposite, where the transmitter knows what devices are linked to it, and sends the order "Lamplinc 'L' turn on" when you press button "B".
Also, is there any real difference between an Insteon primary link and Insteon scenes? I'm assuming no, and that this distinction is a holdover from X10 days.
About how many Insteon devices can you add to a small house before they noticably degrade X10 performance. 5? 10? 20? Is there a suggested limit per circuit?