The sense ports can be set to detect voltage or closure and then initiate an event (like a system macro but a separate process on the processor) based on the condition.

So... you could use a trigger output from a projector so that when you turn that projector on, the XP8 would sense the voltage from that projector and then shut the shades. I have not worked with the a time based scenario yet but I imagine an event could be based on this as well.

There are many cool processes you could simplify by doing this... screen drops or receiver power on based on trigger or video signal, watch DVD macro based on someone powering on the DVD player when they go to load a disc, Lights on automatically with motion detection... This way you would not have to include certain things in your activity macros.