A fully qualifiied path to the Windows system directory.
First available in version 3.0 build 2039.
The actual location of the Windows system directory can vary widely between operating systems and some times even between different installations of the same operating system.
C:\WinNT\System32 (Windows NT 4)
C:\Windows\System (Windows 98)
C:\Windows\System32 (Windows 2000)
This variable is set when SWF Studio starts, and whenever App.updateGlobals is called.