Is either for playing music through cd-rom drive or don't prompt for SoF1-CD, crack-ish thing?
Which shouldn't be needed with SoFplus.
We needed the SoF CD in the optical drive to be able to play in the early days or we would have gotten the "nocd" error.
Many games required the CD in the drive!
Not sure if it had anything to do with the CD_Key which we also needed /or the game read the drive (how often was based on "type of installation" I believe)