Yes. The X10 system allows you to send unit addresses selecting units without sending a command. The next command will operate all selected units. If you give me an email address I will send you a ccf that works this way. I assume you are using the common IR tio X10 converter. Also all units of the house code are adressable, notjust what appears to be available.

i believe all of this data is in a posting on the prontoedit BBS inthe ccf download area, search for "MS word" to find a general discussion of IR to X10 using the Pronto