I just found a very old article of mine, which got published in Dr. Dobb's Journal, the Tech Tips section, on October 1, 2003!  The title of the article was Preventing Class Derivation in Visual C++ .NET.  Either see that link, or read on if you're interested.

OpenVPN is a great project.  It's a shame that their Windows compilation is this painful.  After spending hours trying to compile OpenVPN 2.1_rc7 on Windows using Visual C++, I thought I'd document the process for the benefit of others, and for my own future reference.