If you are referring to the book by Bovet & Cesati, "Understanding the Linux Kernel" (http://www.oreilly.com/catalog/linuxkernel/), I understand there are no official online versions of this book. For good online --and legal-- references I suggest looking to the pointers listed in Juan-Mariano de Goyeneche's recopilation: http://www.dit.upm.es/~jmseyas/linux/kernel/hackers-docs.html Cheers! -- Pablo Bleyer Kocik | pbleyer |"Rintrah roars & shakes his fires in the burdend air; @embedded.cl | Hungry clouds swag on the deep" — William Blake - Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/