Addison-Wesley/Prentice Hall PTR are the leading publishers of advanced technology books written by the most talented technologists, often the inventors of new technologies. Addison-Wesley/Prentice Hall PTR are publishers of the best-known classics, including The UNIX System Administration Handbook by Nemeth, Hein, Seebass and Snyder and W. Richard Stevens' UNIX Network Programming and forthcoming classics, such as Eric S. Raymond's latest book, The Art of UNIX Programming. AW/PHPTR is also publisher of The Bruce Perens' Open Source Series, a leading source for books on Linux and Open Source technologies. True to the spirit of Open Source, each book in the Series is published under the Open Publication License (OPL). AW/PHPTR is proud to feature several of its authors, including Kirk McKusick, Peter Salus and Tom Limoncelli, during LISA author signing events on Tuesday and Wednesday.