Access to a PostGres database from VisualBasic

I wold like to access to a PostGres database from client programs in Visual Basic
in Win95 and server programs in C using de libpq library, but I would like to do it free.
How could I do that? Maybe with RPC? Or with a transaction
monitor like TUXEDO, but free? Do you know any free transaction monitor
with libraries for VisualBasic and Linux, or free RPC libraries for VisualBasic,
or a free rpcgen...? Any idea?
Thanks.
Rafa.