“Most of us are familiar with typical user accounts associated with Unix systems, such as root, nobody, and daemon. Mac OS X has an additional interesting account for a user named “unknown”. Unknown has the UID number 99, which is treated specially within the kernel as well as some user-level libraries. The special properties afforded to unknown are needed to make device sharing between computers as painless as possible. Let us look at what makes unknown so special.”
Read the full article at unixjunkie. Interesting… Really.
