Modern networked operating systems, such as Microsoft Windows, Mac OS X, and the UNIX family of operating systems, allow users to log on to their machines locally by using them directly, or by connecting to a file server remotely through a network logon. Because both logons tend to happen simultaneously after users enter their usernames and passwords, they do not usually perceive much of a difference between the two logons. Network logons can be disabled by administrators, thus preventing individuals from robbing passwords and remotely taking over the machine. Graham, R. Hacking Lexicon. [Online, 2001.] Robert Graham Website: http://www.linuxsecurity.com/resource_files/documentation/hacking-dict.html.