Colored squares on the data tags for airplanes on the controller's radar screen change as pilots respond so that controllers get an extra visual cue in case a pilot doesn't see a message.
This was another case in point and was the cue for the home fans to start chanting for the introduction of Rooney, who was brought on with 20 minutes left.
In case anyone was wondering what those uncertainties might be, Russia's resources minister, right on cue, said Yukos was likely to lose some of its oil production and exploration licences.