wonder how clever it's possible to be with presence sensing ... eg: the following scenario :

make a pot of tea, want to be called when it's ready to pour ... four-button module, one for each type of tea & so for particular times ... when time's up, whoever made the tea needs to be prompted, but could have wandered-off ... don't want to worry the whole house ... want to inform just that person (dip the lights slightly, message on a nearby MFP, short buzz, message on his / her iPhone, message on nearest iPod Touch, whatever) ...

so : can Cortex keep sufficient track of people & things to allow this ???