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+>3.4. How to request background computation</A
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+> You will also notice the presence of a request_background_data() called in the
+constructor. This function, in eventhooks.c, does verify for the presence of the
+state information that could be precomputed by the main window background
+computation. If it has not been precomputed, we ask for a computation and show
+partial data. We also register a hook that will be called (notified) by the main
+window when the requested data will become ready, so the viewer can update
+itself with the new data. If no partial information would have made sense in a
+particular viewer, one could choose to shown a "waiting for computation" message
+while waiting for the notification. See lttvwindow/lttvwindowtraces.h for the API
+of the background requests.
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