To open a main non-mdi form that has a Window's taskbar button;

f = new form()

f.mdi = false

f.open()

To open a child non-mdi form that does not have a Window's taskbar button;

c = new form()

c.mdi = false

c.hWndParent = f.hWnd

c.showTaskBarButton = false

c.open() // or c.readModal()