Environment variables in an operating system are values that contain information about the system environment, and the currently logged in user. They existed in OSes before Windows as well, such as MS-DOS. Applications or services can use the information defined by environment variables to determine various things about the OS, for example, to detect the number of processes, the currently logged in user's name, the folder path to the current user's profile or the temporary files directory. Today, we will review a number of methods you can use to create a new user and system environment variable in Windows 10.
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