Pseudo-terminals:
 http://tldp.org/HOWTO/Text-Terminal-HOWTO-7.html

Job Control and sessions:
 http://www.fh-wedel.de/~di/html/glibc/libc_24.html (Job Control)
 Interesting on 'setsid'.

 http://www.hmug.org/man/4/termios.php (on The Controlling Terminal)