I am digging through 10.8 looking for Network Server

Which class is it that pulls the sql statement off of the DRDA executes it and puts the result set back into DRDA?  Looking for the class that accepts and authenticates the connection then processes the requests.

NetworkServerControlImpl processes the commands for startup, shutdown, etc.

I am sure its just a matter of searching for the right name but not knowing the name makes it hard to find.