The class of attributes which correspond to environment variables. Environment variables are defined outside of a ComputerProgram, unlike ordinary variables that are defined in the source code of the ComputerProgram. Typically, the environment variable stores some value that many if not all ComputerProgams will need when they execute. An example is the environment variable PATH under Unix-like operating systems that stores the ComputerDirectories where executable ComputerPrograms can be found. Another example is the environment variable CLASSPATH for Java programs, which stores the directory where Java class files can be found that will be needed by any ComputerProgram written in Java.
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