> Thanks...I used the embedded version of Firebird to make my application easier to deploy (users have just to expand a zipped file which contains the correct folders and files needed, without having to install Firebird). On Firebird download page there are only Classic/SuperServer versions for Mac OS X. Can these be used to work in standalone mode ?

Yes.

Classic means that for each connection a new process will be forked,
SuperServer will handle each connection in multiple threads. Classic
handles multiple processors/cores correctly, but have smaller page cache.

SuperServer must be assigned to one processor (otherwise it will spend
about 70% time in context switching from one CPU to another), but can
have higher cache numbers.

The Firebird 2.5 was released recently, so sooner or later there will be
also port to Mac OS X, there will be so-called ClassicServer, which will
handle multiple CPUs correctly using one server process.

Roman