Simple solution? See if you can get a copy of either Novell syntax or the software itself, use it, learn it, figure out if there are vulnerabilities based on what you see. For example, it is often possible to hack a console if you are physically at the server - Red Hat Linux and BSD Unix both have relatively simple ways of allowing you to reset the root password, but you must be sitting at the server, not a remote console. There are of course ways to hack them if they haven't been properly secured externally as well...that is I'm sure there are. Novell is "just a network operating system" - the key to hacking an OS is to know the OS, the commands, the way it operates, etc. If you can find a loophole in any of that remotely, then there you have it - but I'm pretty certain somebody has also published an exploit somewhere. Then there's always social engineering, but all too many network administrators are probably all the wiser to that approach...then again, they are running Novell Netware.