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What is a Screensaver?
A screensaver is just an file, with the extension changed from .exe to .scr. File extensions tell the computer what kind of file its dealing with. E.g., winword.exe is a word-processing function that can be loaded by the computer, while article.doc is a text file that can be loaded into the Microsoft Word word-processing application.
An executable file is a file that the computer's operating system considers a program or application. Files ending in .exe (or .scr) are expected to run without the need of another file; or, if they do need another file, they are expected to tell the CPU which particular file is needed.
So we know that, in quintessence, a screensaver is a program. By putting a
screensaver file into the Windows or System directory and giving it a .scr extension,
Windows knows that it should care for this file as a screensaver and makes it
on hand as an option in the exhibit properties window.
The screensaver file can be programmed in several different ways. It can: Simply
present a black screen Use vector graphics to draw a range of designs Load and
display a thorough image or group of images Display a particular line of text
Display an animation or series of animations Play a video sequence Have music
or sound effects Display information from another program or a Web site Provide
the ability to interact with another program or a Web site Require a password
to turn it off and return to the desktop Most screensavers offer some arrangement
of these features. Except for the slide-show screensavers that display a sequence
of images, screensavers generally move an image, piece of text or animation
around the screen.
The screensavers that have a custom interface, and do not use the Display properties
window at all, are less common. Usually, these screensavers do not have the
.scr extension. They necessitate that you install them using a setup program
in order to configure them right.