I was thinking the bridge must have a live feed that all persons can view. If Picard calls to the transporter room "beam that man up now!", Obrien never has to say "what guy? Oops too late." There are various examples in all the series where sickbay, the shuttle bay, security, auxiliary control, life support etc have all been contacted in the midst of some event by the bridge and other stations don't seem to need any briefing on what the Captain is talking about. Can anybody contrast that with working on the larger real word Navy ships? Does a crewmember repairing jets on the lower decks of a carrier know whats going on upstairs? Can a 21st century Captain contact any department on the ship during a crisis and expect a response like Picard gets?