Environment

The key HKCU\Environment defines per-user environment variables. Normally, all you see in this key are two values: TEMP and TMP. Both are REG_EXPAND_SZ values. You can add environment variables to Environment, however, and then use those from within batch files, REG_EXPAND_SZ values, and so on. Of course, you can also rely on the user interface to add environment variables. Click Start, Control Panel, Performance And Maintenance, System, and then click Environment Variables on the System Properties dialog box's Advanced tab. Per-user environment variables are at the top of the dialog box, and per-computer environment variables are at the bottom.