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Access control is really a system enabling authorities to regulate access to areas and resources in the given physical facility or computer-based information system. Access control is, the truth is, perhaps the most common, everyday phenomenon. For example, a lock on the car door is actually a kind of access control. The PIN over a bank's ATM product is another type of access control. Even nightclub bouncers, browsing front of an door, are another example of (perhaps) a much more primitive mode of access control. Using an access control mechanism is vital when persons attempt to secure confidential, important, or sensitive information and equipment.
Windows PCs can be used as general purpose computers for all those varieties of such things as writing letters, editing photos or surfing the Web. However, there's also specialized use times when the PC is supposed to be used only in a very restricted way. Imagine a public kiosk terminal which could only be utilized to allow Web browsing in order to provide usage of an individual, specialized application as being a booking system. Also terminals in museums or at exhibitions have special requirements in terms of security and functionality. In most cases the underlying os (Windows) have to be secured and locked down in a fashion that merely a predefined application can be executed understanding that the conclusion user has no further use of other applications or critical os functions.
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