Linux can crack RDP and VNC protocols, aswell as sniffing with Cain & Abel while using APR attack you can get the hash and then crack it, sniff between two or more computers, i.e a server and a few teachers while doing APR, get the hash and crack it. Read this: http://www.go4expert.com/showthread.php?t=14438 it might help, and read Cain's help file so that you know the tool inside and out: http://www.oxid.it