Let me ask another question (but may be better suited in the ActiveHome section..):
Can you set a light up to be controlled by one switch during certain times of the day and a different switch at other times during the day. In other words, can you disable and enable switches on set schedules? For example, if I wanted something to be motion sensored during certain parts of the day but not others, could I automatically disable that sensor during those times?
Brian H beat me to the answer on this, but I include a couple of drawbacks so will post anyway. Sorry Brian, don't mean to repeat your answer.
Yes you can do all this. Since you don't have X10 I'm not going to be real detailed. In order to disable / enable wall switch function, the wall switches can not actually control the lights directly. One way to do this is use "wire in" lamp modules which are (typically) mounted at the fixture. Then each switch is a transmitter only, it can not directly control the fixture. Each of these units have a unique "House Code", "Unit Code" address and finally you would use AHP conditional macros to actually control the lights the way you want. Example: you "turn on" wall switch "A1". AHP receives the "A1 ON" command and your macro says "IF 'A1 ON' between 9:00 AM and 3:00 PM THEN send 'B3 ON' command" The module controlling the fixture would be addressed as "B3". So all switches get sent to AHP which then, based on macros, sends commands to actually turn on and off the proper lights.
There are a couple of drawbacks:
1. it will take about 2 seconds from the instant you hit the wall switch until the light actually turns on (or off).
2. you lose the power to dim and brighten the fixture from the wall switch. You could dim and brighten with a separate controller.