X Window System Guide, Volume 3: OPEN LOOK Edition Ian Darwin, Valerie Quercia, and Tim O'Reilly Unpublished, 1993 This book is a version of the well-known O'Reilly X Window System User's Guide that was customized for the OPEN LOOK user interface. Due to Sun's de-adoption of OPEN LOOK the book was not published by O'Reilly, but it nonetheless contains useful information about X11 and OPEN LOOK.