Startup "override"

hello here..

im creating a "series" of menus on a pocket computer..
i have startup, botania, bloodmagic, spawners, thermal(not writtenyet, as the API dont work) and lights
in the startup file, i can choose to open the other programs, and control various things..

Heres the thing i would "ask" for help to make

Can i in the startup file, make an option that is named Exit, that returns me to the normal Craft OS, until the pocket comp is rebooted?

thanks :)/>