> I'm writing a UDF in C/C++ and wondering how I get isc_db_handle and
> isc_tr_handle. Apparently I need these to use the BOpen/BOpen2
> methods.

I think this is not possible. Currently there's a discussion in
Firebird-Architect about making it possible to plug in different
stored procedure engines (like PL/SQL and Java), but most likely this
will be done in 2.0. But ask in Firebird-Support.

Roman