"First, desktop Windows stands firmly on a foundation
as a stand-alone PC operating system. It was never, ever meant to
work in a networked world. So, security holes that existed back in
the day of Windows for Workgroups, 1991, are still with us today in
2009 and Windows 7.
"Most of these problems come down to Windows has IPCs
(interprocess communications), procedures that move information
from one program to another, that were never designed with security
in mind. Windows and Windows applications rely on these procedures
to get work done. Over the years they've included DLLs (dynamic
link libraries), OCXs (Object Linking and Embedding (OLE) Control
Extension), and ActiveX. No matter what they're called, they do the
same kind of work and they do it without any regard to
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