Consider the following scenario. You attach more than one monitor to a computer that is running Microsoft Windows XP or Microsoft Windows Server 2003. You set the mirror driver to read data off any portion of the extended desktop and start it. A problem could be observed with any app that can read the data off the mirror driver surface. Those apps may show some icons located on the desktop, and other composited graphic elements generated within some applications, may not be drawn correctly or may be completly missing on the mirror driver's surface.
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