Dear Jahangir,
Sorry, I just aware nobody has not yet answer for your question.
>Can you please clear up the question how to identify the individuals entitlement who are previously registered APNIC conference and eligible on site voting like APNIC 43 meeting ?
In on-site case, if the secretariat find a person not wearing the name tag,
just simply ask whether he or she is a registered participants of current or previous APNIC conferences.
Since we don't need to maintain full list of eligible voters, I believe it is enough.
Regards,
Matt