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Chapter 23. Maintaining and Optimizing S... > Setting Environment Variables

Setting Environment Variables

Settings that you're not likely to use but could still prove handy are the environment variables. What do environment variables do? They're a way to communicate setup information to application programs, from the days before the Registry. They indicate where temporary files are stored, what folder contains Windows program files, and other settings that affect program operation and system performance. In particular, batch files and application programs can use them to find where certain system files and folders are located.

Windows sets up a set of environment variables for you, including the ones listed in Table 23.1.


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