I've tried it on another pc, and it works, kinda. Its returning
localhost/127.0.0.1
If i use a.getHostName()) inside my client javascript, I can get just
localhost, but that isn't my computername.

I understand what localhost is, and why that is referring to
127.0.0.1, so don't explain that old news to. ...but please explain
why I get localhost and not the actual computername, and how to get
the correct computername.