Hi,

> Where can I find the Firebird 2.1 client API documentation?

I don't think it exists at all. You'll have to start with IB 6.0 docs
(Interbase 6.0 API Guide):

http://www.ibphoenix.com/downloads/60ApiGuide.zip

And look through Firebird 1.0-2.1 Release notes for API changes/additions.


Regards,
Anderson Farias