Does vb5 have a stable, documented API?

[atsats]

We recently decided to experiment with vb5 for a new user community we're forming.

We had 2 required customizations: 1) Restrict user registration to pre-determined email domains; 2) Prevent users from changing their email addresses after being accepted as registered users.

We found mods that do these functions for vb4, but they appear not to work for vb5.

So, we wanted to either fix these or create new ones for vb5 - We could not find any programming documentation specific to vb5 and we do not know if the vb4 documentation is applicable to vb5.

Also, judging from some of the old, unanswered posts in this forum, it appears that the vb5 API is neither well documented nor supported.

The question that I have for the experienced members of the vb community is this: Is there a stable, documented API for vb5 that can be used for the above 2 requirements? If yes, can you please point us to where the API documentation is?