The following program code demonstrates a couple of different uses of the PType property. Remember that each Param[x] element is really a TParamRecord-type component.
procedure TForm1.Button1Click(Sender: TObject);
begin
with RPCBroker1 do begin
RemoteProcedure := 'SET NICK NAME';
Param[0].Value := 'DUZ';
Param[0].PType := reference;
Param[1].Value := edtNickName.Text;
Param[1].PType := literal;
Call;
end;
end;