System Administrator Guide : 4. Setting Environment Variables : Windows Environment Variables
 
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Windows Environment Variables
Windows environment variables are set at the operating system level. They take effect before, during, and after Vector is invoked. II_SYSTEM and PATH are the only environment variables used directly by Vector. These are set in the user’s environment using the following commands entered at the operating system prompt:
set environment_variable=value
Alternatively, you can set Windows environment variables through the Control Panel.