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I have a normal application example (the code is this, but not is a service) that make screenshots of a non secure active desktop created by a 3rd's application. For example: https://i.stack.imgur.com/NJoOG.jpg This 3rd application is a "browser application" that uses CEF to render the websites. My goal is open a fullscreen form in foreground (covering all screen above) and be able to make screenshot of the content behind of this fullscreen form (the 3rd application). I searched by some hint about this and found these similar discussions: How do I capture desktop screenshot behind full screen form? Screenshot using Magnification API: SetThreadDesktop fails when alternates to a new desktop I also had tested using PrintWindow api (to capture only the 3rd's application), but this results in a black screen (in chromium content) because probably the 3rd's application uses CEF with hardware acceleration resource active. For example: https://i.stack.imgur.com/taMdX.png All works fine in Windows XP, 7 (disabling Aero theme) - with ALPHABLEND = TRUE on fullscreen Form. The second discussion found seems more near of solution to my trouble, because this uses a api apparently able to remove a determinated window of screencapture. I tested this example left by author, works only if call ConfigMag() prodecure after routine that contains SetThreadDesktop api. Eg: if InputDesktopSelected then xGetScreenToBmp(idx) else if SelectDesktop(nil) then // result of SelectDesktop() is a routine that calls SetThreadDesktop begin ConfigMag; xGetScreenToBmp(idx); end; except on E: Exception do Writeln(E.ClassName, ': ', E.Message); end; Readln; Already if i want make screenshots periodically, this will fails like was said by author. Then my trouble still not was solved.