projection matrix control & child window

[kwkim]

I have a two question.

Q1 :
In general, I know that it is possible to apply the 2D image processing module on the rendering buffer image of virtual camera.
That is, I know that this is worked in the post processing step.

But the I want to get the realtime rendering output in the projection matrix step by using direct variation effect algorithm.
Can we control the camera projection rendering model maden by virtual camera directly by using OSG(Open) code ?

Q2 :
I want to make a child window with the vizard execution main window.
Also I want to display 3D rendering outputs in the child window.(see image)