Brian,
Thanks for your interest, and for that information. FWIW my x10 estate mainly comprises lighting controlled by LW12s and AW12s, both of which can be programmed to respond to any/all of All lights on, All lights off, All Off. I also have some AM12s, which respond to All Off (and are not programmable).
And my impression is that here in UK and Europe, All Lights Off may be a bit more common.
One of my objectives for the CM15 is to support an SS13 at the front door to turn off all lighting on leaving the house, but I want to retain the option of not turning off any equipment that happens to be connected via an AM12.
I've had a (fairly cursory) scan through the executable (well actually AHP_marmitek.dll), and it seems relatively unlikely that there's any functionality in AHP to issue an All Lights Off - but I'd love to hear otherwise. FWIW Marmitek's printed "user manual", and flyers for the CM15Pro/ActiveHomePro combo clearly state that "It" can transmit All Lights Off, so I will enquire of them. I'm stubbornly reading "It" as the combo, of course, and equally stubbornly reading "can transmit" as "can originate" (not merely tranceive).
Isn't this fun?
A.