Setting Java_home On Mac For Every Session

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• OS: the operating system • SystemRoot: the system root directory. Environment variables are useful to store system-wide values such as the directories to search for the executable programs ( PATH) and the OS version.. Examples of environment variables in Windows OS are: • COMPUTENAME, USERNAME: stores the computer and current user name.. What are Environment Variables? Environment variables are global system variables accessible by all the processes running under the Operating System (OS).