A support headache cured.

Computerworld > Microsoft discontinues Windows... 3.x

As of November 1, 2008 Microsoft has stopped issuing licences for Windows 3.x, which debuted in May 1990.

DOS Special Characters

DDB: DOS Characters: "A Short Discussion of DOS Symbols"

Useful resource - Impossible to find on MSDN

Windows Environment Variables
DOS Commands A-M
DOS Commands N-Z

Warning: the GUI is for the seriously art challenged! Orange text on black - seriously ugly.