Client-server problem

Good morning.
I'm installed Navision 4.0, byt haven't client-server connection.
Server computer has Windows2000 Server OS installed by default (after install there were not up addition services), Navision 4.0 Server with non-demo license, Navision 4.0 Single-user Client (with demo DB).
Client computer has Windows2000 Professional OS, Navision 4.0 Multi-user Client.
There are no Active Directory and domain structure in my office. Problem is: from inside client soft there isn't "see" server, in accessable server list ("Server Name") there is only string "[Client Only]", but there is ping between client computer and server one and port 2407 (default Navision server port) is opened. Server computer and client one considered in the same LAN (my office LAN).