I need to understand the global on and off a little better.

All of my device remotes use the same button to turn them on or off-meaning they use the same frequency for both on and off.

If, for example, I have six devices and three are currently on and the remaing three devices are currently off, how do you prevent the devices that are presently off from turning on when you issue a global off command for the devices you want to turn off? Is there a sensor that can determine which devices are on or off?