Just one answer sorry:

> - Is it possible to de-activate interbase.log, or to give it a
> maximum size?

Not without moding the code, although if you made it impossible to write to,
it may work. I would set up a cron type job to delete it every day or so.

> - I saw that 3 files have been created:
> isc_init1.<hostname>
> isc_event1.<hostname>

No idea what these are for.

> isc_lock1.<hostname>
> What are these files for? Are their sire going to grow?

I don't think this should get very big, on a heavily used NT server it gets
no bigger than 100KB.