Usage of OC4J in Release 12

 We have gather below details but still unable to understand that why two services are there in OC4J in Release 12. My questions are:

[1] If OACORE is there and most of the components are based on Framework in Release 12 then what is the requirement of OAFM? 

[2] Is OAFM is only for mapviewer, ascontrol and "Oracle Transport Agent" if we use them?

[3] Why there is seperate process for HTTP_Server as given below if OACORE is already there.

I have gathered below details from various source but still unable to understand fully above three questions.

* Oacore: This runs the OA Framework -based applications (Core Application Modules).
* Forms: This runs the Forms-based applications (using Servlet Mode).
* OAFM (Oracle Apps Fusion Middleware): This is responsible for running the web services , mapviewer, ascontrol (Oracle Transport Agent).


[oratrain@ndaeasdb01 scripts]$ ./adopmnctl.sh status

You are running adopmnctl.sh version 120.4

Checking status of OPMN managed processes...

Processes in Instance: TRAIN_ndaeasdb01.ndaeasdb01.xone.xansa.com
------------------------------------------------+---------
ias-component | process-type | pid | status
------------------------------------------------+---------
OC4J | oafm | 19974 | Alive
OC4J | forms | 19888 | Alive
OC4J | oacore | 19768 | Alive
HTTP_Server | HTTP_Server | 19711 | Alive



Web Entry Point Services          HTTP Server 

Web Application Services          OACORE OC4J 
                    Forms OC4J 
                    OAFM OC4J