How do two computers find each other over the Internet?

409365 pts.
Tags:
ISP
Networking
UDP
We have two computers that are attached to the Internet that know nothing of each other beforehand. Is it possible for one computer to be able to broadcast a message so the second computer receives it and responds? I already know that UDP broadcast exists, but aren't those filtered by the ISP before it reaches the Internet. Is that true?

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