> > Read carefully "Remodelled Architecture" part.
>
> As far as I understand that, I just call "fbclient.dll" as usual,
> and if the database path is a local file, "fbclient.dll" automagically
> calls "engine12.dll" (or whatever it needs) for the use as a local/
> embedded server. Correct?
>
> Which leads my to the question: Which of the 274 files in the 3.0.2
> ZIP are necessary to be copied into the client's application directory
> in order to run the embedded server? (Of course, as few as possible...)

This might help....
https://www.lawinegevaar.nl/firebird/jaybird_embedded_example.html
Jaybird with Firebird embedded example and the section Details on embedded use

Regards
Paul