I am a bit confused how the client/server model work in the case of
using the fbclient.dll API.

The isc_attach_database() api as well as the example code shipped with
the Firebird server looks the same as the one I used for embedded
database call.

But how does the filename C:\Firebird\examples\employee.fdb specified
in the isc_attach_database()?

There is a isc_service_attach() API, does this one I should use if I
want to attach to the remote Firebird database server?

jml