The Windows temporary directory is where Windows creates temporary working files.
First available in version 3.0 build 2039.
The Windows temporary directory may vary on different operating systems but it should always be a directory where you have read/write/create/delete file permissions. You can use this location to store files but you should remove any files you create here before your application ends to avoid filling up the temporary directory.
This variable is set when SWF Studio starts, and whenever App.updateGlobals is called.