User Accounts
A good place to start is with the concept of user-based security. For the most part, only two types of people access the system as users. (Although there are other accounts that run programs and processes, here we are talking about accounts that represent human beings rather than something like an account created for a web server process.) Most people have a regular user account. These users can change anything that is specific to their accounts, such as the wallpaper on the desktop, their personal preferences, and the configuration for a program when it is run by them using their account. Note that the emphasis is on anything that is specific to their accounts. This type of user cannot make systemwide changes that could affect ...
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