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OpenGL opengl, qt, mdi and vieports

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I modified a 3d engine for the qt library, i have inserted a opengl scene in a simple widget.
The problem is that i have try to create a mdi opengl application, then i can have more than one viewport with inside a different opengl scene.
The engine(wild magic5) is built for only one viewport.
Now if i try to create more than one subwindow ,only the lastest have a correct visualization.
The other is black and draw nothing.
How i can create multiple vieport in opengl?
I think to call glviewport(x,x,x,x) in the render function on the widget, but i have a doubt:
now all viewport coordinates are 0,0,100,100 , but i have access to mdisubwindow object from the render function, but what coordinates i must use? how i can do?

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