Please note that the content of this book primarily consists of
articles available from Wikipedia or other free sources online. A
screensaver is a type of computer program initially designed to
prevent phosphor burn-in on CRT and plasma computer monitors by
blanking the screen or filling it with moving images or patterns
when the computer is not in use. Contemporary screensavers are used
primarily for entertainment or security. Decades before the first
computers utilizing this technology were invented, Robert A.
Heinlein postulated that they would be needed in his novel Stranger
In A Strange Land. Before the advent of LCD screens, most computer
screens were based on cathode ray tubes. When the same image is
displayed on a CRT screen for long periods of time, the properties
of the exposed areas of phosphor coating on the inside of the
screen gradually and permanently change, eventually leading to a
darkened shadow or "ghost" image on the screen.
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