Is it possible for a form to cover the entiry screen (full screen) even the taskbar

It must be possible, because a lot of setup programs do it. I'm not sure what calls you'd have to make to do this, though.

> and not allowing it to minimize with ALT+TAB or windows key

You could set the MinButton property to .f., then call the Win32 API SetWindowPos() function with HWND_TOPMOST.

First of all,

Thank you very very much

But there still is a problem, i never call any API before
Can u give me a sample of how to call the Win32 API SetWindowPos()?