How to get the DNS name of a local machine

342435 pts.
Tags:
DNS
Networking
I'm trying to create a peer-to-peer instant messaging application and I've run into some difficulties. Now for the users, I want them to the actual hostname of their own machine so both users will see the same text (AKA User 1 and 2). I apologize if this is a dumb question but I just can't figure out how to do it.

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