When you use the TRPCBroker component for Delphi, you are able to call the GetServerInfo function to retrieve the end-user workstation's server and port settings.
The functionality provided by GetServerInfo is not currently available through the RPC Broker 32-bit DLL interface. A future version of the RPC Broker will provide access to the GetServerInfo functionality for DLL users.
To work around this for now, when using the RPC Broker 32-bit DLL, you should prompt the user directly for the server and port to connect to.