I just upgraded to Mac OS 9 and noticed that the options to "Protect System Folder" and "Protect Applications folder" in the General Controls control panel are always dimmed. Why can't I select these options?

These features are now part of the Multiple Users control panel. If you need to prevent users from altering the System Folder or Applications folder, consider setting up a restricted user account with Multiple Users. Because these features are in Multiple Users, the older features in the General Controls control panel have been removed.

For information regarding other Mac OS versions, please see the following Knowledge Base articles:

Article 16597: " Mac OS: Dimmed Options In General Controls Panel "
Article 17172: " System 7.5: Folder Protection Option Not Available "