i did some additional tests and installed SPB Brain Evolution (fullscreen game using EDGELIB) and Resco Guardians (fullscreen game using GapiDraw). SPB Brain Evolution didn't block alarms or emails although running in fullscreen. So i guess there should be a way around this issue. And Resco Guardians behaves the same like the fireworks sample. No alarms were fired and no emails arrived until the game terminated.