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+======Synopsis:======
+[[on]] [<modes>]window_beforekill [<serial#>] [-|^]<match> { <action> }
+======Description:======
+This hook is triggered just before a window is killed.  It is permissible
+to query any data you want about the window, but it is NOT PERMISSIBLE to
+try to change anything about the window, particularly its visibility.  If
+you try to change the window, you may crash the client.  Use /[[DEFER]] to be
+on the safe side.
+This hook represents your last chance to save data about a window before
+everything about that window's history is permanently erased.
+======Parameters:======
+|$0 |The window that is about to be nixed.|