Making something opaque over the screen

[Cameron111]

Dear Everyone,

I'd like to know how to make an opaque screen that I can drag across the screen
with C++. You'd be able to see the background clearly behind this screen. :)

[blackcoder41]

Use the AnimateWindow function

AnimateWindow(hwnd, 0, AW_BLEND);

http://msdn.microsoft.com/en-us/library/windows/desktop/ms632669(v=vs.85).aspx