Start sockets via fork creates 2 instances?

Hello

I trying to develop a server-application via sockets. To serve more 
than one
requests, I started the server with 'forkAt: Processor 
highIOPriority' and I
got 2 instances of Socket! The example-implementations of Socket 
([Socket
remoteTestServerTCP] forkAt: Processor highIOPriority) works same. 
Starts
the server without 'forkAt:', only one instance will be created.
Is this the correct behavior?

Thanks in advance for your ideas 
Steffen