There is no built in way to change this functionality. When locked, one screen will be black. There may be some 3rd party software that may do this however it would not be supported by Microsoft.
Matthew Arkin - Windows Answers Moderator - Windows Desktop Experience MVP - http://twitter.com/Microsoft\_Cares
This forum post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.
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So because Microsoft does not support such a software application, should it exist, you want to end this thread and keep people from spreading the word about a workaround? Simply because the solution is outside the purview of Microsoft and your own narrowly
focused support doesn't justify marking your own answer as the correct one. I thought this was a community based forum where people come to find help with difficult issues. I don't see how telling someone "Any possible solution isn't supported by Microsoft"
is helpful.