A screensaver is a programme which, after a pre-set time
during which the computer has not been used, replaces the image onscreen
and displays moving objects to protect against "screen burn"
(damage to the screen caused by a stationary image being displayed for
too long and burning the phosphor).
(Collin, S.M.H. [ed.], Dictionary of Multimedia, Peter Collin Publishing,
Teddington, Middlesex, 1995, pp232-3)
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