You put up lots of work into that request so I guess it aint that important.
If I am wrong, teach me better, and describe in here again what you actual want, and if that PBOL is taken from here, add a link to it so interested coders can take a look on without needed to waste time to search for it.
From technical side spoken, if mouser has created the Mainwindow and hides it without destroying, it is possible, if there is just an icon in taskbar that creates the window, it is impossible by Winapi in a generic way to show something that isnt there.