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4/8/2010
Use DirectDraw with caution in environments that require high security.
DirectDraw exists to enable high-performance multimedia applications. It does this by providing applications with the most direct path possible to the 2-D graphics hardware on a system.
DirectDraw applications can take control of the screen by putting themselves into full-screen exclusive mode. As long as the application remains open it can retain complete control of the entire display.
You should always use secure coding techniques while working with DirectDraw.