Repeat 4.13
	System Call
	queeg:	/usr/man/man2
	man -s 2 unlink pipe shmctl

	Basic idea behin Morris's Worm
	4.18
	4.20
	show 
		http://ftp.cerias.purdue.edu/pub/doc/morris_worm/worm.paper
	for passwords
	show code
		http://www.foo.be/docs-free/morris-worm/worm/
	when done
	Src/worm/cracksome.c
	Src/worm/stubs.c
	Src/worm/wormdes.c
	in short
		4.28
OS Security
	Plan 9
	Inferno
	Java