Flip-3D on WinXP and taking layered screenshot

I have two questions but somehow related:

1. How to 开发者_如何学Goimplement flip 3d without Aero APIs on Windows XP?

2. Have you guys seen this awesome app on Mac? http://layersapp.com Is there any possibility to have something similar on Windows? If the #1 question is solved I think we can make something like that

I know how to take a screenshot of a single window, just read the bitmap of a DC. But how to take screenshots of those windows not active on the top?

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But how to take screenshots of those windows not active on the top?

You might be able to do this via the PrintWindow function. There are some caveats to be aware of. Here is an article detailing its usage: Capturing Windows Regardless of Their Z-Order.