[zabzonk]

Well, MessageBox() in the Win32 API is just a simple C function call: https://learn.microsoft.com/en-us/windows/win32/api/winuser/...

I wrote a blog about this many years ago: https://latedev.wordpress.com/2011/10/06/simple-windows-dial...

[dcrazy]

It’s everything leading up to the MessageBox() call that VB makes trivial.