When introduced to Mac OS X in 2003, Singh encountered myths about the system and task-oriented books but none on its internal structure. Currently an operating systems researcher at Google, he here fills this perceived gap largely through examples directed to programmers in C-language. The treatment also offers tours of the important features of the Apple system's architecture for non-programmers, although he stresses that Mac OS X is largely architecture-independent. A supporting website is available, as well as a searchable electronic version of the book free for a limited time. Annotation ©2006 Book News, Inc., Portland, OR (booknews.com)