obivously I have no idea what you're trying to do ...
If you're using mIRC then there maybe a way .... since paltalk doesn't show up address ... it's hard to dectect the second user is the same at the first user.
Since mIRC user mask host example ...
user@sdfasdfasf.hostname.com ... Paltalk gives you no information ... so there is no way that you can detect as CLONE DETECTION ...
i dont' know if that's the right idea ... CLONE DETECTION ...