War Dialer - A computer program that automatically dials a series of telephone numbers to find lines connected to computer systems, and catalogs those numbers so that a cracker can try to break into the systems.
White hat hackers - An ethical hacker who hacks for legitimate reasons, such as finding weaknesses in computer systems or networks.
Windowing - A windowing system is a system for sharing a computer's graphical display presentation resources among multiple applications at the same time. In a computer that has a graphical user interface (GUI), you may want to use a number of applications at the same time (this is called task). Using a separate window for each application, you can interact with each application and go from one application to another without having to reinitiate it. Having different information or activities in multiple windows may also make it easier for you to do your work. A windowing system uses a window manager to keep track of where each window is located on the display screen and its size and status. A windowing system doesn't just manage the windows but also other forms of graphical user interface entities.
Wired Equivalent Privacy (WEP) - A security protocol for wireless local area networks defined in the standard IEEE 802.11b.
Wireless Application Protocol - A specification for a set of communication protocols to standardize the way that wireless devices, such as cellular telephones and radio transceivers, can be used for Internet access, including e-mail, the World Wide Web, newsgroups, and Internet Relay Chat.
WLAN - Wireless networks for mobile Internet access.
World Wide Web ("the Web", WWW, W3) - The global, hypermedia-based collection of information and services that is available on Internet servers and is accessed by browsers using Hypertext Transfer Protocol and other information retrieval mechanisms.
Worm - A type of malware that can replicate and run itself.