Hello.

Can the mouse message be passed to the window in the back?

I made the window with the TOPMOST attribute. This has the same size
as the screen. Moreover, it is half transparent window.

OS delivers the mouse message to this window when the mouse is moved or
it clicks. Therefore, the user cannot operate other windows hidden in the
window.

I tried.
It threw out some mouse message using PostMessage functions. The
window handle used and acquired the WindowFromPoint function.
However, it did not operate well.

Please teach something a good idea.