How I can get the display packet of every context i.e. welcome screen, UI screen, secure desktop scr

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I am working on the project of Remote Desktop Access on windows 8.
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since we all know that mirror driver XDDM is replaced by WDDM. And all the calls to get the display packets is going through DXGI. The desktop duplication API are the example of it.
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What I want to know is How I can get the display packet of every context i.e. welcome screen, UI screen, secure desktop screen ?
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I had tried to start desktop duplication through service but didnt able to get UI context packets.
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Below remarks will not helping me too much ? Any suggestions
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http://msdn.microsoft.com/en-us/library/windows/desktop/hh404611(v=vs.85).aspx http://msdn.microsoft.com/en-us/library/windows/desktop/hh404611(v=vs.85).aspx
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<span style="font-size:11.818181991577148px All current <strong style="font-size:11.818181991577148px IDXGIOutputDuplication <span style="font-size:11.818181991577148px interfaces become invalid when the operating system switches
to a different component that produces the desktop image or when a mode change occurs. In these situations, the application must destroy its current <strong style="font-size:11.818181991577148px IDXGIOutputDuplication <span style="font-size:11.818181991577148px interface
and create a new <strong style="font-size:11.818181991577148px IDXGIOutputDuplication <span style="font-size:11.818181991577148px interface.<br/>

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Examples of situations in which IDXGIOutputDuplication becomes invalid are:
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Desktop switchMode changeSwitch from DWM on, DWM off, or other full-screen application
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In these situations, the application must release the IDXGIOutputDuplication interface and must create a new IDXGIOutputDuplication interface for the new content. If the application does not have the appropriate
privilege to the new desktop image, its call to the http://msdn.microsoft.com/en-us/library/windows/desktop/hh404600(v=vs.85).aspx" style="text-decoration:none; color:#03697a IDXGIOutput1:uplicateOutput method fails.


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