Security Screensaver software can to some extent perform a security function. For example, a lot of screensavers have the option of asking a user for a password to permit him to start working. However, there is a way to enter just by restarting the computer. But it works if the owner of computer set an option to log in automatically upon start-up. |
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Purpose Before LCD screens appeared, the main technology of computer screen production was based on cathode ray tubes (CRTs). The disadvantage of CRT screens is appearance of a dark shadow which happens due to the changes of phosphor coating after the same image is displayed for a long time. In fact, the devices with CRTs have a problem with phosphor burn-in as well as plasma displays. |
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