unsigned driver
A driver that is not supported and that is not certified to work with a particular version of Windows.

virus
A program that attempts to spread from computer to computer and either cause damage (by erasing or corrupting data) or annoy users (by printing messages or altering what is displayed on the screen).

wildcard character
A keyboard character that can be used to represent one or many characters when conducting a query. The question mark (?) represents a single character, and the asterisk (*) represents one or more characters.

wireless communication
Communication between a computer and another computer or device without wires. The form of wireless communication provided as part of the Windows operating system uses infrared (IR) light to transmit files. Radio frequencies, as used by cellular and cordless telephones, are another form of wireless communication.