Problem with different windows

[Peppino Incasa]

Hi,
I have a problem with multiple X windows. I would realized a windows that 
draw the content of another window of different application  (in this case 
this is a opengl window). I don't understand as I can retrive a opengl 
framebuffer for drawing this in new and different window, using GLX 
function.

Thank you and sorry for my English.

Peppino

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