-The types of background computation that can be requested by a viewer : state
-computation (main window scope) or viewer specific background computation.
-
-A background computation request is asked via lttvwindow_events_request, with a
-priority field set with a low priority.
-
-In the case of a background computation with viewer pointer field set to NULL,
-if a lttvwindow_events_request_remove_all is done on the viewer pointer, it will
-not affect the state computation as no viewer pointer will have been passed in
-the initial request. This is the expected result. For the background processings
-that call viewer's hooks, they will be removed.
-
+A background computation has a trace scope, and is therefore not linked to a
+main window. It is not detailed in this document.
+see requests_servicing_schedulers.txt