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:menuselection:`My Computer --> Properties --> Advanced --> Environment Variables`
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In this dialog, you can add or modify User and System variables. To change System variables, you need non-restricted access to your machine (i.e. Administrator rights).
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Another way of adding variables to your environment is using the :command:`set` command::
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To make this setting permanent, you could add the corresponding command line to your :file:`autoexec.bat`. :program:`msconfig` is a graphical interface to this file.
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Viewing environment variables can also be done more straight-forward: The command prompt will expand strings wrapped into percent signs automatically::
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Consult :command:`set /?` for details on this behaviour.
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Environment variables in Windows NT
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