Setting a system environment variable from a Windows batch file?

[Clippy]

Setting a system environment variable from a Windows batch file?

[Clippy]

The XP Support Tools (which can be installed from your XP CD) come with a program called `setx.exe`:

```
C:\Program Files\Support Tools>setx /?

SETX: This program is used to set values in the environment
of the machine or currently logged on user using one of three modes.

1) Command Line Mode: setx variable value [-m]
Optional Switches:
-m Set value in the Machine environment. Default is User.

...
For more information and example use: SETX -i

```

I think Windows 7 actually comes with `setx` as part of a standard install.