Sentence:  Apple, IBM, and Motorola have teamed up to produce this 32-bit chip that will be used in future Apple Macintoshes and IBM PCs. PowerPC systems will run <WSD>Mac</WSD> or Unix programs, and possibly Windows software in the future. 
Meaning of the word marked with <WSD> tags:  A Macintosh computer (made by Apple Inc.), or its operating system.