How can addon module affect clientarea actions responses

[Arsen]

There is a domain without dns management support from registrar, what my addon module need to do to enable the domaindns action for that doamin? (clientarea.php?action=domaindns&domainid=1)
I tried to change `tbldomains` dnsmanagement field and `tbldomainpricing` dnsmanagement field.. but that seems to be unrelated.

I tried to ask similar thing on other thread, but this seems to be more appropriate place to ask. I now know that addon modules can affect that, but still don't know the way.