How to know when window created by cvNamedWindow is closed

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How to know when window created by cvNamedWindow is closed

tennesseephil
If I use cvNamedWindow() to display a window, how can I be notified
when the user clicks X to close that window?  Can I set up some sort of
call-back routine?

On a related topic, is there any way to suppress the border at the top
with the name of the window and the control boxes?