This is the window managing part which handles decoration and displays running applications as desktop icons if minimized.
But where is the Program Manager?
But where is the Program Manager?
The developer surely knew that there would be people that asked for the Program Manager, because it wasn't only a name for the desktop itself (like the Explorer with additional file manager windows). It was Windows. If you closed the Program Manager application, you were prompted a message box "Wanna exit Windows?"
So there's a difference between implementing Windows 3 style desktop, and implementing the Program Manager (as kind of an early Start Menu).