The joke is that uneducated users routinely shared whole drives or system directories, including personal files and configuration data with passwords, but it co

The joke is that uneducated users routinely shared whole drives or system directories, including personal files and configuration data with passwords, but it could also be used as a trick if you didn't have a big drive, or anything more valid to share. As for file access, I doubt that many people have used non-administrator accounts on their own home computers. It was recognized when UAC was added to distinguish “real administrative tasks” for the administrator. TrustedInstaller limiting and 32-bit/64-bit virtualization divide happened later.