How VC 7.3 deployed component will be used in Portal ?

Hi Guys,

                I can see Visual Composer 7.3 can be directly deployed in WebDynpro as an application.

1. How it can be used in Portal ? like create Java webDynpro iView from created VC 7.3 application..?

2. If want to use RFC/BAPI Data model in VC 7.3.. simply creating RFC destination for SAP ECC 6 will bring RFC's in the search result..?

    or Do I have to create webservice out of RFC/BAPI to utilise them as Model in VC 7.3..?

3. Why SAP introduce separate composite environment 7.3 server from Portal server ?

Thanks

Sam