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http://home.zyrianes.net/cgi-bin/wkcgi.cgi/Article/143.html
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http://www.onlamp.com/pub/a/bsd/2004/07/01/freesbie.html
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http://www.linuxjournal.com/article.php?sid=7655
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http://www.livinglogic.de/Python/sisyphus
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http://www.debianplanet.org/node.php?id=816&cid=11292
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http://jmcpherson.org/screen.html
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http://www.zeroflux.org/knock
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http://shfs.sourceforge.net
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http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html
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http://www.inf.bme.hu/~mszeredi/avfs