It's mentioned in the book Programmer's Guide to MPW: Exploring the Macintosh Programmer's Workshop by Mark Andrews [0]. [0] https://vintageapple.org/macprogra

It's mentioned in the book Programmer's Guide to MPW: Exploring the Macintosh Programmer's Workshop by Mark Andrews [0]. [0] https://vintageapple.org/macprogramming/pdf/Programmers_Guide_to_MPW_1990.pdf https://vintageapple.org/macprogramming/pdf/Programmers_Guid...