Just being a bit pedantic here but...
To all extents and purposes, the default FB SS 0.9.4p1 install off
SourceForge *appears* to be
super server, but I just noticed /opt/interbase/README states "Firebird 1.0
Classic Server for Linux"... ;-)

I'm assuming this is just a typo, or is it referring to something other than
the internal architecture?

Cheers,

Andrew