gnome-sharp 2.20.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. Used when the wishes to interact with the user at the session manager's convenience (usually during shutdown and restarts). The instance doing the interaction. A unique key. The that should be used to do the interaction. All other s are blocked from interacting with the user until the key is released via a call to . Although the function is not obliged to respect the passed in , it is bad form not to do so. System.Delegate System.Void