How To Manage Environment Variables in Windows XP
https://support.microsoft.com/en-us/topic/how-to-manage-environment-variables-in-windows-xp-5bf6725b-655e-151c-0b55-9a8c9c7f747d
These variables are established by Windows XP Setup, by some programs, and by users. The changes are written to the registry, and are usually effective immediately. However, after a change to user environment variables is made, any open software programs should be restarted to force them to read the new registry values. The common reason to add ...
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