Ok Let me restart...

I have a server running Firebird in application mode (-a switch). During
the night some maintenance need to be done on that server. Before the
maintenance start I need to close the Firebird server and restart it at
the end. I don't want to kill the Firebird process because I don't want
to corrupt my databases, I want to close it cleanly. I know there is
already a way to shutdown the database only but how to do with
fbserver.exe ? ( BTW I forgot to mention I am running Windows version).

Hope this is more clear.