Am I right in assuming that a BIO can be defined through Wap?

From the documentation I notice in the BIO information file that there is an ID_TYPE EWap that I guess is the way of supporting BIO for Wap. If so it seems I need to add an NBS port to identify the message.

I'm struggling to find any documentation on NBS. How can I define this from my WML/ASP pages on my webserver?

Thanks in advance for your replies
C