How you reconcile which app gets which gesture then? Would two unlocks trigger both a machine unlock, a text to my mom, and to start playing my podcasts? Not to

How you reconcile which app gets which gesture then? Would two unlocks trigger both a machine unlock, a text to my mom, and to start playing my podcasts? Not to mention that it's like pulling teeth to get Apple to allow things to happen in the background. I was intrigued at how they did this from a locked phone, and it turns out they don't. You have to have the app launched before knocking, meaning at it's core, this is just a shake listener with a count and some Bluetooth code. Not that it's not worth $4 (yeah, app isn't free), but it's not getting my $4 yet, since typing my password is still easier and plenty secure.