Think of it like a restaurant. If you are hungry, you don’t walk into the kitchen and fix what you want. You ask for a menu, then choose an item from it. If you want something that is not on that menu, you can ask the waiter, who will send a request to the cook. But there is no guarantee you’ll get it. What happens inside the walled-off area in question is completely up to the single team that owns it, so long as they don’t change how information can be exchanged. If change becomes necessary, the owners publish a revised set of rules—a new menu, if you will—and all those who rely on them are
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