Privilege
User account
Administrators
These users have the most privileges. They can change any system configuration parameter and access any file in the system.
Standard Users
These users can access the computer but only perform limited tasks. Typically these users can not make permanent or essential changes to the system and are limited to their files.
System account
SYSTEM / LocalSystem
An account used by the operating system to perform internal tasks. It has full access to all files and resources available on the host with even higher privileges than administrators.
Local Service
Default account used to run Windows services with "minimum" privileges. It will use anonymous connections over the network.
Network Service
Default account used to run Windows services with "minimum" privileges. It will use the computer credentials to authenticate through the network.
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