Is there a utility to make the window of any application "transparent" to the mouse?

Question

Windows

It is necessary that you can select the window of any application and make it with a little transparency and that it hangs on top of all windows, and most importantly, it is "transparent" for the mouse, that is, it was impossible to click on it, and you could click on the controls under this window of other applications. Kind of like a Windows message "Windows activation...".
Utilities to make a window on top of all a great many. Are there such utilities?

Answer 1

Yes, it’s full, like the actual window manager was so good, you can do it through ahk