instant on
n. A proposed feature that would enable a computer to be ready for use as soon as it is turned on.

Example Citation:
"Then [Microsoft], based in Redmond, Wash., plans 'sometime in 2000' to release a new consumer version of Windows that will offer an as-yet-unannounced set of easy-to-use consumer features, such as 'instant on.' "
—John Markoff, "Behind the Big Shift on Windows," The New York Times

Related Word: