Surely he can use X.10 filters to split the house wiring circuits into two "LANs" as he suggests, and then use the same 256 addresses independantly on each "LAN":

[Link: smarthome.com]

OK, he'll need to split the building wiring at the distribution point to install the filter and he'll need two computer interfaces, one on each LAN, and will have to run two instances of whatever software he is using to control them, or work out some automated way of switching between two different COM ports to select the right interface. But that's the challenge, the rest should be easy.

This message was edited by davehk on 03/10/04 04:34.