Take a look at this thread regarding that issue. Accesspoint means you are using a Web Server (either IIS or the QVWS), while when properly configured, the Plugin will not need this middle step, which results in better off performance. But it all depends on your network configuration and user clients, whther they allow 4747 por open or they don't, and the communication is tunneled via port 80.
Port 4774 is internal only, used between the QVS and the ISAPI DLL tunneler when using IIS, so it should not be opened to the public.
Hope that helps.