Don't know about the Netware version, but in the Windows version, all the Agent Serial does is unlock the capability on the server.
If you enter one RemoteAgent serial, and then do 20 silent/local installs, all 20 remote agents will be accepted when a backup actually runs. it's your responsibility to have 1 remote agent serial for each remote server
This actually works out well if you have several media servers. If you need to run a special backup, you don't have to do it on the media server that "owns" the agent on that target machine.