How to find remote devices with C++?

I thought of an app idea, a really good one (in my opinion), but I don't feel like saying it.

So, how does the "Find My iPhone" app work? Is it a networking language, or some other... "sorcery" haha. But what would one have to learn in order to make something similar.

-And no... in case you were wondering, it is nothing illegal. It is not for tracking people and hunting them down and stuff. So just letting you no before you assume anything.
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