Win32: full-screen and hiding taskbar

Question

I have a window, which I SetWindowPos(window, HWND_TOP, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN), SWP_FRAMECHANGED);

It covers

Answer 1

I believe the taskbar will get out of the way when its shell hook tells it about a "rude app", this might take a little while.

What if you start out with the window HWND_TOPMOST and make it not top most after 1 second?