What is /Library/StagedExtensions for and how to remove extensions [closed]

Answer 1

sudo kextcache --clear-staging

Was in folder HD/Library/

Cheers

Edit: Formatting

Edit2: I believe that Parallels writes some files directly into the bootloader/kernel. After running the command from the CMD+R hold restart Disk Utility Terminal the extension was removed from /Library .

I hope this makes sense.