Answer:
As you know the on going situation we are in, barcodes can be really useful for an example using them to check into a building that way when there is a infected person it is a really esay process to track down people that have been in that area.
There are ways to break into the boot cycle of every machine, you could use one of them. Hold down modifier key[s] so that it boots differently or you may get a menu to select boot options.
A specific answer is OS/firmware dependent.
Maybe Encouragement? I don't know, are there any choices to choose from?
