It seems some people don't understand how X10s work, probably me, but here's what I understand.
The hand remote HR12A sends an RF signal to the Wireless transceiver TM751 which converts the RF signal into code which is transmitted over the electrical line of the house.
These codes will activate LM465 lamp modules and AM486 appliance modules. But the wireless transceiver also has a relay, as described here in the text from the Product manual.
(Plug a lamp or appliance into the outlet on the TM751 (observe the ratings on the back of the TM751). Press 1 ON and OFF on the remote control to control the light/appliance connected to the TM751.)
But the WM100, which receives commands from my phone via the router, and who has to convert these commands into code and send them over the power line, does not have the correct code to activate the TM751. Here in Montreal, we call it a design flaw. Am I wrong?